tests: don't use only-64bit in mir-opt tests.

src/test/mir-opt/inline/inline-into-box-place.rs

 // ignore-wasm32-bare compiled with panic=abort by default
 // compile-flags: -Z mir-opt-level=3
-// only-64bit FIXME: the mir representation of RawVec depends on ptr size
+// EMIT_MIR_FOR_EACH_BIT_WIDTH
 #![feature(box_syntax)]
 
 // EMIT_MIR rustc.main.Inline.diff

src/test/mir-opt/inline/inline-into-box-place/32bit/rustc.main.Inline.diff

+- // MIR for `main` before Inline
++ // MIR for `main` after Inline
+  
+  fn main() -> () {
+      let mut _0: ();                      // return place in scope 0 at $DIR/inline-into-box-place.rs:7:11: 7:11
+      let _1: std::boxed::Box<std::vec::Vec<u32>> as UserTypeProjection { base: UserType(0), projs: [] }; // in scope 0 at $DIR/inline-into-box-place.rs:8:9: 8:11
+      let mut _2: std::boxed::Box<std::vec::Vec<u32>>; // in scope 0 at $DIR/inline-into-box-place.rs:8:29: 8:43
+      let mut _3: ();                      // in scope 0 at $DIR/inline-into-box-place.rs:8:42: 8:43
++     let mut _4: &mut std::vec::Vec<u32>; // in scope 0 at $DIR/inline-into-box-place.rs:8:33: 8:43
+      scope 1 {
+          debug _x => _1;                  // in scope 1 at $DIR/inline-into-box-place.rs:8:9: 8:11
+      }
++     scope 2 {
++     }
+  
+      bb0: {
+          StorageLive(_1);                 // bb0[0]: scope 0 at $DIR/inline-into-box-place.rs:8:9: 8:11
+          StorageLive(_2);                 // bb0[1]: scope 0 at $DIR/inline-into-box-place.rs:8:29: 8:43
+          _2 = Box(std::vec::Vec<u32>);    // bb0[2]: scope 0 at $DIR/inline-into-box-place.rs:8:29: 8:43
+-         (*_2) = const std::vec::Vec::<u32>::new() -> [return: bb2, unwind: bb4]; // bb0[3]: scope 0 at $DIR/inline-into-box-place.rs:8:33: 8:43
++         _4 = &mut (*_2);                 // bb0[3]: scope 0 at $DIR/inline-into-box-place.rs:8:33: 8:43
++         ((*_4).0: alloc::raw_vec::RawVec<u32>) = const ByRef { alloc: Allocation { bytes: [4, 0, 0, 0, 0, 0, 0, 0], relocations: Relocations(SortedMap { data: [] }), undef_mask: UndefMask { blocks: [255], len: Size { raw: 8 } }, size: Size { raw: 8 }, align: Align { pow2: 2 }, mutability: Not, extra: () }, offset: Size { raw: 0 } }: alloc::raw_vec::RawVec::<u32>; // bb0[4]: scope 2 at $SRC_DIR/liballoc/vec.rs:LL:COL
+                                           // ty::Const
+-                                          // + ty: fn() -> std::vec::Vec<u32> {std::vec::Vec::<u32>::new}
+-                                          // + val: Value(Scalar(<ZST>))
++                                          // + ty: alloc::raw_vec::RawVec<u32>
++                                          // + val: Value(ByRef { alloc: Allocation { bytes: [4, 0, 0, 0, 0, 0, 0, 0], relocations: Relocations(SortedMap { data: [] }), undef_mask: UndefMask { blocks: [255], len: Size { raw: 8 } }, size: Size { raw: 8 }, align: Align { pow2: 2 }, mutability: Not, extra: () }, offset: Size { raw: 0 } })
+                                           // mir::Constant
+-                                          // + span: $DIR/inline-into-box-place.rs:8:33: 8:41
+-                                          // + user_ty: UserType(1)
+-                                          // + literal: Const { ty: fn() -> std::vec::Vec<u32> {std::vec::Vec::<u32>::new}, val: Value(Scalar(<ZST>)) }
++                                          // + span: $SRC_DIR/liballoc/vec.rs:LL:COL
++                                          // + user_ty: UserType(0)
++                                          // + literal: Const { ty: alloc::raw_vec::RawVec<u32>, val: Value(ByRef { alloc: Allocation { bytes: [4, 0, 0, 0, 0, 0, 0, 0], relocations: Relocations(SortedMap { data: [] }), undef_mask: UndefMask { blocks: [255], len: Size { raw: 8 } }, size: Size { raw: 8 }, align: Align { pow2: 2 }, mutability: Not, extra: () }, offset: Size { raw: 0 } }) }
++         ((*_4).1: usize) = const 0usize; // bb0[5]: scope 2 at $SRC_DIR/liballoc/vec.rs:LL:COL
++                                          // ty::Const
++                                          // + ty: usize
++                                          // + val: Value(Scalar(0x00000000))
++                                          // mir::Constant
++                                          // + span: $SRC_DIR/liballoc/vec.rs:LL:COL
++                                          // + literal: Const { ty: usize, val: Value(Scalar(0x00000000)) }
++         _1 = move _2;                    // bb0[6]: scope 0 at $DIR/inline-into-box-place.rs:8:29: 8:43
++         StorageDead(_2);                 // bb0[7]: scope 0 at $DIR/inline-into-box-place.rs:8:42: 8:43
++         _0 = ();                         // bb0[8]: scope 0 at $DIR/inline-into-box-place.rs:7:11: 9:2
++         drop(_1) -> [return: bb2, unwind: bb1]; // bb0[9]: scope 0 at $DIR/inline-into-box-place.rs:9:1: 9:2
+      }
+  
+      bb1 (cleanup): {
+          resume;                          // bb1[0]: scope 0 at $DIR/inline-into-box-place.rs:7:1: 9:2
+      }
+  
+      bb2: {
+-         _1 = move _2;                    // bb2[0]: scope 0 at $DIR/inline-into-box-place.rs:8:29: 8:43
+-         StorageDead(_2);                 // bb2[1]: scope 0 at $DIR/inline-into-box-place.rs:8:42: 8:43
+-         _0 = ();                         // bb2[2]: scope 0 at $DIR/inline-into-box-place.rs:7:11: 9:2
+-         drop(_1) -> [return: bb3, unwind: bb1]; // bb2[3]: scope 0 at $DIR/inline-into-box-place.rs:9:1: 9:2
+-     }
+- 
+-     bb3: {
+-         StorageDead(_1);                 // bb3[0]: scope 0 at $DIR/inline-into-box-place.rs:9:1: 9:2
+-         return;                          // bb3[1]: scope 0 at $DIR/inline-into-box-place.rs:9:2: 9:2
+-     }
+- 
+-     bb4 (cleanup): {
+-         _3 = const alloc::alloc::box_free::<std::vec::Vec<u32>>(move (_2.0: std::ptr::Unique<std::vec::Vec<u32>>)) -> bb1; // bb4[0]: scope 0 at $DIR/inline-into-box-place.rs:8:42: 8:43
+-                                          // ty::Const
+-                                          // + ty: unsafe fn(std::ptr::Unique<std::vec::Vec<u32>>) {alloc::alloc::box_free::<std::vec::Vec<u32>>}
+-                                          // + val: Value(Scalar(<ZST>))
+-                                          // mir::Constant
+-                                          // + span: $DIR/inline-into-box-place.rs:8:42: 8:43
+-                                          // + literal: Const { ty: unsafe fn(std::ptr::Unique<std::vec::Vec<u32>>) {alloc::alloc::box_free::<std::vec::Vec<u32>>}, val: Value(Scalar(<ZST>)) }
++         StorageDead(_1);                 // bb2[0]: scope 0 at $DIR/inline-into-box-place.rs:9:1: 9:2
++         return;                          // bb2[1]: scope 0 at $DIR/inline-into-box-place.rs:9:2: 9:2
+      }
+  }
+