Introduce ToNumber stub and use it in non-optimized code for to-number conver...

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
===================================================================
--- src/ia32/full-codegen-ia32.cc	(revision 6513)
+++ src/ia32/full-codegen-ia32.cc	(working copy)
@@ -3747,8 +3747,8 @@
       Label no_conversion;
       __ test(result_register(), Immediate(kSmiTagMask));
       __ j(zero, &no_conversion);
-      __ push(result_register());
-      __ InvokeBuiltin(Builtins::TO_NUMBER, CALL_FUNCTION);
+      ToNumberStub convert_stub;
+      __ CallStub(&convert_stub);
       __ bind(&no_conversion);
       context()->Plug(result_register());
       break;
@@ -3868,8 +3868,8 @@
     __ test(eax, Immediate(kSmiTagMask));
     __ j(zero, &no_conversion);
   }
-  __ push(eax);
-  __ InvokeBuiltin(Builtins::TO_NUMBER, CALL_FUNCTION);
+  ToNumberStub convert_stub;
+  __ CallStub(&convert_stub);
   __ bind(&no_conversion);
 
   // Save result for postfix expressions.