Unify SMI case inlining for ToNumberStub.

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 121ab2d1a0d9b4b70e70c0fbf3a5dfa36bf1c009..bac4e793b279bf4a86353db7024aa92352219e79 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -4420,7 +4420,9 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
 
   // Call ToNumber only if operand is not a smi.
   Label no_conversion;
-  __ JumpIfSmi(rax, &no_conversion, Label::kNear);
+  if (ShouldInlineSmiCase(expr->op())) {
+    __ JumpIfSmi(rax, &no_conversion, Label::kNear);
+  }
   ToNumberStub convert_stub;
   __ CallStub(&convert_stub);
   __ bind(&no_conversion);