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

src/crankshaft/x64/lithium-codegen-x64.cc

 // Copyright 2013 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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/crankshaft/x64/lithium-codegen-x64.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 5502 matching lines @@
   DCHECK(!environment->HasBeenRegistered());
   RegisterEnvironmentForDeoptimization(environment, Safepoint::kNoLazyDeopt);
 
   GenerateOsrPrologue();
 }
 
 
 void LCodeGen::DoForInPrepareMap(LForInPrepareMap* instr) {
   DCHECK(ToRegister(instr->context()).is(rsi));
 
-  Condition cc = masm()->CheckSmi(rax);
-  DeoptimizeIf(cc, instr, Deoptimizer::kSmi);
-
-  STATIC_ASSERT(JS_PROXY_TYPE == FIRST_JS_RECEIVER_TYPE);
-  __ CmpObjectType(rax, JS_PROXY_TYPE, rcx);
-  DeoptimizeIf(below_equal, instr, Deoptimizer::kWrongInstanceType);
-
   Label use_cache, call_runtime;
-  Register null_value = rdi;
-  __ LoadRoot(null_value, Heap::kNullValueRootIndex);
-  __ CheckEnumCache(null_value, &call_runtime);
+  __ CheckEnumCache(&call_runtime);
 
   __ movp(rax, FieldOperand(rax, HeapObject::kMapOffset));
   __ jmp(&use_cache, Label::kNear);
 
   // Get the set of properties to enumerate.
   __ bind(&call_runtime);
   __ Push(rax);
   CallRuntime(Runtime::kGetPropertyNamesFast, instr);
-
-  __ CompareRoot(FieldOperand(rax, HeapObject::kMapOffset),
-                 Heap::kMetaMapRootIndex);
-  DeoptimizeIf(not_equal, 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, Smi::FromInt(0));
@@ skipping 106 matching lines @@
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64