Temporarily disable optimization for StringWrappers to use native valueOf

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index f08a269e85b576e46b7036fdbd6febc94732687b..bfe1f2231250ab025cd551d235e0cf170f58a869 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -3030,10 +3030,6 @@ void FullCodeGenerator::EmitIsStringWrapperSafeForDefaultValueOf(
          ContextOperand(edx,
                         Context::STRING_FUNCTION_PROTOTYPE_MAP_INDEX));
   __ j(not_equal, if_false);
-  // Set the bit in the map to indicate that it has been checked safe for
-  // default valueOf and set true result.
-  __ or_(FieldOperand(ebx, Map::kBitField2Offset),
-         Immediate(1 << Map::kStringWrapperSafeForDefaultValueOf));
   __ jmp(if_true);
 
   PrepareForBailoutBeforeSplit(expr, true, if_true, if_false);