[strong] Disallow implicit conversions for binary arithmetic operations

src/x64/full-codegen-x64.cc

Index: src/x64/full-codegen-x64.cc
diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
index 2ad757f843c5e47feb0583f7d3e8ef95ff7247de..50752cf06bd88c62f93d254ab01fcaf90f38a01e 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -2420,7 +2420,8 @@ void FullCodeGenerator::EmitInlineSmiBinaryOp(BinaryOperation* expr,
 
   __ bind(&stub_call);
   __ movp(rax, rcx);
-  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), op).code();
+  Handle<Code> code = CodeFactory::BinaryOpIC(
+      isolate(), op, language_mode()).code();
   CallIC(code, expr->BinaryOperationFeedbackId());
   patch_site.EmitPatchInfo();
   __ jmp(&done, Label::kNear);
@@ -2532,7 +2533,8 @@ void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit) {
 
 void FullCodeGenerator::EmitBinaryOp(BinaryOperation* expr, Token::Value op) {
   __ Pop(rdx);
-  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), op).code();
+  Handle<Code> code = CodeFactory::BinaryOpIC(
+      isolate(), op, language_mode()).code();
   JumpPatchSite patch_site(masm_);    // unbound, signals no inlined smi code.
   CallIC(code, expr->BinaryOperationFeedbackId());
   patch_site.EmitPatchInfo();
@@ -4944,8 +4946,8 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
   __ bind(&stub_call);
   __ movp(rdx, rax);
   __ Move(rax, Smi::FromInt(1));
-  Handle<Code> code =
-      CodeFactory::BinaryOpIC(isolate(), expr->binary_op()).code();
+  Handle<Code> code = CodeFactory::BinaryOpIC(
+      isolate(), expr->binary_op(), language_mode()).code();
   CallIC(code, expr->CountBinOpFeedbackId());
   patch_site.EmitPatchInfo();
   __ bind(&done);