[strong] Disallow implicit conversions for comparison

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 cdd57074ce2b0bd2280dc21a32c4e53d5e1a5523..ac80be239beddd62168d2068348475f63247a4bf 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -1018,8 +1018,8 @@ void FullCodeGenerator::VisitSwitchStatement(SwitchStatement* stmt) {
 
     // Record position before stub call for type feedback.
     SetSourcePosition(clause->position());
-    Handle<Code> ic =
-        CodeFactory::CompareIC(isolate(), Token::EQ_STRICT).code();
+    Handle<Code> ic = CodeFactory::CompareIC(isolate(), Token::EQ_STRICT,
+                                             language_mode()).code();
     CallIC(ic, clause->CompareId());
     patch_site.EmitPatchInfo();
 
@@ -5178,7 +5178,8 @@ void FullCodeGenerator::VisitCompareOperation(CompareOperation* expr) {
 
       // Record position and call the compare IC.
       SetSourcePosition(expr->position());
-      Handle<Code> ic = CodeFactory::CompareIC(isolate(), op).code();
+      Handle<Code> ic =
+          CodeFactory::CompareIC(isolate(), op, language_mode()).code();
       CallIC(ic, expr->CompareOperationFeedbackId());
       patch_site.EmitPatchInfo();