Remove strong mode support from count operations.

src/full-codegen/arm64/full-codegen-arm64.cc

Index: src/full-codegen/arm64/full-codegen-arm64.cc
diff --git a/src/full-codegen/arm64/full-codegen-arm64.cc b/src/full-codegen/arm64/full-codegen-arm64.cc
index f0d5059999e2361d138618eb0ca7dfeb2ee7d1dd..d69e4f2cc5988c4aa88858fd437c6ed98b868579 100644
--- a/src/full-codegen/arm64/full-codegen-arm64.cc
+++ b/src/full-codegen/arm64/full-codegen-arm64.cc
@@ -3494,11 +3494,11 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
     __ B(&stub_call);
     __ Bind(&slow);
   }
-  if (!is_strong(language_mode())) {
-    ToNumberStub convert_stub(isolate());
-    __ CallStub(&convert_stub);
-    PrepareForBailoutForId(expr->ToNumberId(), TOS_REG);
-  }
+
+  // Convert old value into a number.
+  ToNumberStub convert_stub(isolate());
+  __ CallStub(&convert_stub);
+  PrepareForBailoutForId(expr->ToNumberId(), TOS_REG);
 
   // Save result for postfix expressions.
   if (expr->is_postfix()) {
@@ -3540,9 +3540,6 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
   }
   __ Bind(&done);
 
-  if (is_strong(language_mode())) {
-    PrepareForBailoutForId(expr->ToNumberId(), TOS_REG);
-  }
   // Store the value returned in x0.
   switch (assign_type) {
     case VARIABLE: