Revert of [strong] Implement strong mode restrictions on property access

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 20619e6e77f96c8e274d8ea4d84f020528ff4110..331584a30aa6d7b69d66c22c59c5ba7aec193d70 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -2864,7 +2864,7 @@
   __ Move(LoadDescriptor::NameRegister(), instr->name());
   EmitVectorLoadICRegisters<LLoadGlobalGeneric>(instr);
   ContextualMode mode = instr->for_typeof() ? NOT_CONTEXTUAL : CONTEXTUAL;
-  Handle<Code> ic = CodeFactory::LoadICInOptimizedCode(isolate(), mode, SLOPPY,
+  Handle<Code> ic = CodeFactory::LoadICInOptimizedCode(isolate(), mode,
                                                        PREMONOMORPHIC).code();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }
@@ -2980,10 +2980,9 @@
 
   __ Move(LoadDescriptor::NameRegister(), instr->name());
   EmitVectorLoadICRegisters<LLoadNamedGeneric>(instr);
-  Handle<Code> ic =
-      CodeFactory::LoadICInOptimizedCode(
-          isolate(), NOT_CONTEXTUAL, instr->hydrogen()->language_mode(),
-          instr->hydrogen()->initialization_state()).code();
+  Handle<Code> ic = CodeFactory::LoadICInOptimizedCode(
+                        isolate(), NOT_CONTEXTUAL,
+                        instr->hydrogen()->initialization_state()).code();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }
 
@@ -3279,9 +3278,9 @@
     EmitVectorLoadICRegisters<LLoadKeyedGeneric>(instr);
   }
 
-  Handle<Code> ic = CodeFactory::KeyedLoadICInOptimizedCode(
-                        isolate(), instr->hydrogen()->language_mode(),
-                        instr->hydrogen()->initialization_state()).code();
+  Handle<Code> ic =
+      CodeFactory::KeyedLoadICInOptimizedCode(
+          isolate(), instr->hydrogen()->initialization_state()).code();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 }