Cast only where necessary

src/librustc_codegen_llvm/common.rs

@@ -333,20 +333,21 @@ fn from_const_alloc(
         offset: Size,
     ) -> PlaceRef<'tcx, &'ll Value> {
         assert_eq!(alloc.align, layout.align.abi);
+        let llty = self.type_ptr_to(layout.llvm_type(self));
         let llval = if layout.size == Size::ZERO {
             let llval = self.const_usize(alloc.align.bytes());
-            unsafe { llvm::LLVMConstIntToPtr(llval, self.type_ptr_to(self.type_i8p())) }
+            unsafe { llvm::LLVMConstIntToPtr(llval, llty) }
         } else {
             let init = const_alloc_to_llvm(self, alloc);
             let base_addr = self.static_addr_of(init, alloc.align, None);
 
-            unsafe { llvm::LLVMConstInBoundsGEP(
+            let llval = unsafe { llvm::LLVMConstInBoundsGEP(
                 self.const_bitcast(base_addr, self.type_i8p()),
                 &self.const_usize(offset.bytes()),
                 1,
-            )}
+            )};
+            self.const_bitcast(llval, llty)
         };
-        let llval = self.const_bitcast(llval, self.type_ptr_to(layout.llvm_type(self)));
         PlaceRef::new_sized(llval, layout, alloc.align)
     }