X87: [stubs] ToNumberStub --> ToNumber builtin.

  port 406146ff(r36870)

  original commit message:
  This makes sure we do not compile ToNumber stub on demand. This makes it
  easier to use during concurrent compilation.

BUG=

Review-Url: https://codereview.chromium.org/2088633003
Cr-Commit-Position: refs/heads/master@{#37125}

src/full-codegen/x87/full-codegen-x87.cc

@@ -3211,7 +3211,7 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
   }
 
   // Convert old value into a number.
-  __ Call(masm->isolate()->builtins()->ToNumber(), RelocInfo::CODE_TARGET);
+  __ Call(isolate()->builtins()->ToNumber(), RelocInfo::CODE_TARGET);
   PrepareForBailoutForId(expr->ToNumberId(), BailoutState::TOS_REGISTER);
 
   // Save result for postfix expressions.