[strong] Refactor ObjectStrength into a replacement for strong boolean args

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 48ad79378ebaa2849d14934f1be50f1e49df333e..8308edd969d311185954769ec742b41ad3d4c601 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -2099,8 +2099,8 @@ void LCodeGen::DoArithmeticT(LArithmeticT* instr) {
   DCHECK(ToRegister(instr->right()).is(rax));
   DCHECK(ToRegister(instr->result()).is(rax));
 
-  Handle<Code> code = CodeFactory::BinaryOpIC(
-      isolate(), instr->op(), instr->language_mode()).code();
+  Handle<Code> code =
+      CodeFactory::BinaryOpIC(isolate(), instr->op(), instr->strength()).code();
   CallCode(code, RelocInfo::CODE_TARGET, instr);
 }
 
@@ -2543,7 +2543,8 @@ void LCodeGen::DoStringCompareAndBranch(LStringCompareAndBranch* instr) {
   DCHECK(ToRegister(instr->context()).is(rsi));
   Token::Value op = instr->op();
 
-  Handle<Code> ic = CodeFactory::CompareIC(isolate(), op, SLOPPY).code();
+  Handle<Code> ic =
+      CodeFactory::CompareIC(isolate(), op, Strength::WEAK).code();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 
   Condition condition = TokenToCondition(op, false);
@@ -2828,7 +2829,7 @@ void LCodeGen::DoCmpT(LCmpT* instr) {
   Token::Value op = instr->op();
 
   Handle<Code> ic =
-      CodeFactory::CompareIC(isolate(), op, instr->language_mode()).code();
+      CodeFactory::CompareIC(isolate(), op, instr->strength()).code();
   CallCode(ic, RelocInfo::CODE_TARGET, instr);
 
   Condition condition = TokenToCondition(op, false);