[for-in] Sanitize for-in optimizations and fix bailout points.

src/crankshaft/arm/lithium-codegen-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/arm/lithium-codegen-arm.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/crankshaft/arm/lithium-gap-resolver-arm.h"
@@ skipping 5433 matching lines @@
   // If the environment were already registered, we would have no way of
   // backpatching it with the spill slot operands.
   DCHECK(!environment->HasBeenRegistered());
   RegisterEnvironmentForDeoptimization(environment, Safepoint::kNoLazyDeopt);
 
   GenerateOsrPrologue();
 }
 
 
 void LCodeGen::DoForInPrepareMap(LForInPrepareMap* instr) {
-  __ SmiTst(r0);
-  DeoptimizeIf(eq, instr, Deoptimizer::kSmi);
-
-  STATIC_ASSERT(JS_PROXY_TYPE == FIRST_JS_RECEIVER_TYPE);
-  __ CompareObjectType(r0, r1, r1, JS_PROXY_TYPE);
-  DeoptimizeIf(le, instr, Deoptimizer::kWrongInstanceType);
-
   Label use_cache, call_runtime;
-  Register null_value = r5;
-  __ LoadRoot(null_value, Heap::kNullValueRootIndex);
-  __ CheckEnumCache(null_value, &call_runtime);
+  __ CheckEnumCache(&call_runtime);
 
   __ ldr(r0, FieldMemOperand(r0, HeapObject::kMapOffset));
   __ b(&use_cache);
 
   // Get the set of properties to enumerate.
   __ bind(&call_runtime);
   __ push(r0);
   CallRuntime(Runtime::kGetPropertyNamesFast, instr);
-
-  __ ldr(r1, FieldMemOperand(r0, HeapObject::kMapOffset));
-  __ LoadRoot(ip, Heap::kMetaMapRootIndex);
-  __ cmp(r1, ip);
-  DeoptimizeIf(ne, instr, Deoptimizer::kWrongMap);
   __ bind(&use_cache);
 }
 
 
 void LCodeGen::DoForInCacheArray(LForInCacheArray* instr) {
   Register map = ToRegister(instr->map());
   Register result = ToRegister(instr->result());
   Label load_cache, done;
   __ EnumLength(result, map);
   __ cmp(result, Operand(Smi::FromInt(0)));
@@ skipping 111 matching lines @@
   __ push(ToRegister(instr->function()));
   CallRuntime(Runtime::kPushBlockContext, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8