Experimental: tiny change to enable using the shorter byte-register test...

src/codegen-ia32.cc

Index: src/codegen-ia32.cc
===================================================================
--- src/codegen-ia32.cc	(revision 1320)
+++ src/codegen-ia32.cc	(working copy)
@@ -1030,7 +1030,7 @@
       frame_->Spill(operand.reg());
       __ add(Operand(operand.reg()), Immediate(value));
       deferred->enter()->Branch(overflow, &operand, not_taken);
-      __ test(Operand(operand.reg()), Immediate(kSmiTagMask));
+      __ test(operand.reg(), Immediate(kSmiTagMask));
       deferred->enter()->Branch(not_zero, &operand, not_taken);
       deferred->BindExit(&operand);
       frame_->Push(&operand);