Avoid a call to the runtime system when doing binary fp ops on ARM...

src/codegen-ia32.h

Index: src/codegen-ia32.h
===================================================================
--- src/codegen-ia32.h	(revision 1707)
+++ src/codegen-ia32.h	(working copy)
@@ -35,9 +35,6 @@
 class RegisterAllocator;
 class RegisterFile;
 
-// Mode to overwrite BinaryExpression values.
-enum OverwriteMode { NO_OVERWRITE, OVERWRITE_LEFT, OVERWRITE_RIGHT };
-
 enum InitState { CONST_INIT, NOT_CONST_INIT };
 enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
 
@@ -435,7 +432,7 @@
   void GenericBinaryOperation(
       Token::Value op,
       SmiAnalysis* type,
-      const OverwriteMode overwrite_mode = NO_OVERWRITE);
+      OverwriteMode overwrite_mode);
 
   // If possible, combine two constant smi values using op to produce
   // a smi result, and push it on the virtual frame, all at compile time.