Don't bother zeroing out slots in cleanups.

Author: msullivan

src/comp/middle/trans.rs

@@ -2359,11 +2359,7 @@ fn copy_ty(cx: &@block_ctxt, v: ValueRef, t: ty::t) -> result {
 
 fn drop_slot(cx: &@block_ctxt, slot: ValueRef, t: &ty::t) -> result {
     let llptr = load_if_immediate(cx, slot, t);
-    let re = drop_ty(cx, llptr, t);
-    let llty = val_ty(slot);
-    let llelemty = lib::llvm::llvm::LLVMGetElementType(llty);
-    call_bzero(cx, slot, llsize_of(llelemty), C_uint(1u));
-    ret re;
+    ret drop_ty(cx, llptr, t);
 }
 
 fn drop_ty(cx: &@block_ctxt, v: ValueRef, t: ty::t) -> result {