[Interpreter]: Add support for strict mode load / store ICs.

src/interpreter/bytecode-generator.cc

Index: src/interpreter/bytecode-generator.cc
diff --git a/src/interpreter/bytecode-generator.cc b/src/interpreter/bytecode-generator.cc
index df9f21cb8529556672d6f84d50d2ffe69200aeb8..d5805b2c02cf31ea01f5b19fe0b6c6e5a85df91d 100644
--- a/src/interpreter/bytecode-generator.cc
+++ b/src/interpreter/bytecode-generator.cc
@@ -687,7 +687,7 @@ void BytecodeGenerator::VisitCompareOperation(CompareOperation* expr) {
   Visit(left);
   builder()->StoreAccumulatorInRegister(temporary);
   Visit(right);
-  builder()->CompareOperation(op, temporary, language_mode());
+  builder()->CompareOperation(op, temporary, language_mode_strength());
 }
 
 
@@ -726,7 +726,7 @@ void BytecodeGenerator::VisitArithmeticExpression(BinaryOperation* binop) {
   Visit(left);
   builder()->StoreAccumulatorInRegister(temporary);
   Visit(right);
-  builder()->BinaryOperation(op, temporary);
+  builder()->BinaryOperation(op, temporary, language_mode_strength());
 }
 
 
@@ -735,6 +735,11 @@ LanguageMode BytecodeGenerator::language_mode() const {
 }
 
 
+Strength BytecodeGenerator::language_mode_strength() const {
+  return strength(language_mode());
+}
+
+
 int BytecodeGenerator::feedback_index(FeedbackVectorSlot slot) const {
   return info()->feedback_vector()->GetIndex(slot);
 }