Correct handling of adding a string and a smal integer...

Correct handling of adding a string and a smal integer

The fast case of looking up the string convertion of the smi did not handle the case where left/reghe operands could be in eax/edx instead of edx/eax which is the default.

Also got rid of creating an internal frame for calling string and instead patched the argument on the stack and performed a tail call.

BUG=http://code.google.com/p/v8/issues/detail?id=636
TEST=test/mjsunit/regress/regress-636.js

Committed: http://code.google.com/p/v8/source/detail?r=4061

[Erik Corry, 2010-03-09 09:07:34]

LGTM