emit premonomorphic ics for loads/stores in optimized code

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 1af400138692a7a37c5b37a9b951f7d17756ae49..775a948be2298ff618a2c9c2073b2c6c99014f1a 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -2886,7 +2886,8 @@ void LCodeGen::DoLoadGlobalGeneric(LLoadGlobalGeneric* instr) {
     EmitVectorLoadICRegisters<LLoadGlobalGeneric>(instr);
   }
   ContextualMode mode = instr->for_typeof() ? NOT_CONTEXTUAL : CONTEXTUAL;
-  Handle<Code> ic = CodeFactory::LoadICInOptimizedCode(isolate(), mode).code();
+  Handle<Code> ic =
+      CodeFactory::LoadICInOptimizedCode(isolate(), mode, false).code();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }
 
@@ -3029,8 +3030,9 @@ void LCodeGen::DoLoadNamedGeneric(LLoadNamedGeneric* instr) {
   if (FLAG_vector_ics) {
     EmitVectorLoadICRegisters<LLoadNamedGeneric>(instr);
   }
-  Handle<Code> ic =
-      CodeFactory::LoadICInOptimizedCode(isolate(), NOT_CONTEXTUAL).code();
+  bool emit_megamorphic = instr->hydrogen()->emit_megamorphic();
+  Handle<Code> ic = CodeFactory::LoadICInOptimizedCode(
+                        isolate(), NOT_CONTEXTUAL, emit_megamorphic).code();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }
 
@@ -4270,7 +4272,9 @@ void LCodeGen::DoStoreNamedGeneric(LStoreNamedGeneric* instr) {
   DCHECK(ToRegister(instr->value()).is(StoreDescriptor::ValueRegister()));
 
   __ Move(StoreDescriptor::NameRegister(), instr->hydrogen()->name());
-  Handle<Code> ic = StoreIC::initialize_stub(isolate(), instr->language_mode());
+  bool emit_megamorphic = instr->hydrogen()->emit_megamorphic();
+  Handle<Code> ic = StoreIC::initialize_stub(isolate(), instr->language_mode(),
+                                             emit_megamorphic);
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }