[strong] Disallow implicit conversions for binary arithmetic operations

src/x87/lithium-codegen-x87.cc

Index: src/x87/lithium-codegen-x87.cc
diff --git a/src/x87/lithium-codegen-x87.cc b/src/x87/lithium-codegen-x87.cc
index 1aee565feb3acfd2aa5058aeecc464a45c8dc521..13dfc17345f028d757d61387854e54aed7deee8f 100644
--- a/src/x87/lithium-codegen-x87.cc
+++ b/src/x87/lithium-codegen-x87.cc
@@ -2346,7 +2346,8 @@ void LCodeGen::DoArithmeticT(LArithmeticT* instr) {
   DCHECK(ToRegister(instr->right()).is(eax));
   DCHECK(ToRegister(instr->result()).is(eax));
 
-  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), instr->op()).code();
+  Handle<Code> code = CodeFactory::BinaryOpIC(
+      isolate(), instr->op(), language_mode()).code();
   CallCode(code, RelocInfo::CODE_TARGET, instr);
 }