librustc: De-`@mut` `llvm_insns` in the stats

src/librustc/middle/trans/base.rs

@@ -3268,7 +3268,8 @@ pub fn trans_crate(sess: session::Session,
         }
     }
     if ccx.sess.count_llvm_insns() {
-        for (k, v) in ccx.stats.llvm_insns.iter() {
+        let llvm_insns = ccx.stats.llvm_insns.borrow();
+        for (k, v) in llvm_insns.get().iter() {
             println!("{:7u} {}", *v, *k);
         }
     }

src/librustc/middle/trans/builder.rs

@@ -54,7 +54,7 @@ pub fn count_insn(&self, category: &str) {
         }
         if self.ccx.sess.count_llvm_insns() {
             base::with_insn_ctxt(|v| {
-                let h = &mut self.ccx.stats.llvm_insns;
+                let mut h = self.ccx.stats.llvm_insns.borrow_mut();
 
                 // Build version of path with cycles removed.
 
@@ -82,11 +82,11 @@ pub fn count_insn(&self, category: &str) {
                 s.push_char('/');
                 s.push_str(category);
 
-                let n = match h.find(&s) {
+                let n = match h.get().find(&s) {
                     Some(&n) => n,
                     _ => 0u
                 };
-                h.insert(s, n+1u);
+                h.get().insert(s, n+1u);
             })
         }
     }

src/librustc/middle/trans/common.rs

@@ -135,7 +135,7 @@ pub struct Stats {
     n_inlines: Cell<uint>,
     n_closures: Cell<uint>,
     n_llvm_insns: Cell<uint>,
-    llvm_insns: HashMap<~str, uint>,
+    llvm_insns: RefCell<HashMap<~str, uint>>,
     fn_stats: ~[(~str, uint, uint)] // (ident, time-in-ms, llvm-instructions)
 }
 

src/librustc/middle/trans/context.rs

@@ -220,7 +220,7 @@ pub fn new(sess: session::Session,
                     n_inlines: Cell::new(0u),
                     n_closures: Cell::new(0u),
                     n_llvm_insns: Cell::new(0u),
-                    llvm_insns: HashMap::new(),
+                    llvm_insns: RefCell::new(HashMap::new()),
                     fn_stats: ~[]
                   },
                   tydesc_type: tydesc_type,