[Arguments] Remove the arguments shadow symbol.

[Arguments] Remove the arguments shadow symbol.

The only essential use remaining was to detect an allocated arguments object
to avoid OSR.  The shared function info now has a flag indicating that there
might be an allocated arguments object so we can avoid OSR for those
functions.

R=ager@chromium.org

Committed: http://code.google.com/p/v8/source/detail?r=7287

[Kevin Millikin (Chromium), 2011-03-21 13:46:27]

http://codereview.chromium.org/6685119/diff/1/src/ia32/full-codegen-ia32.cc
File src/ia32/full-codegen-ia32.cc (right):

http://codereview.chromium.org/6685119/diff/1/src/ia32/full-codegen-ia32.cc#n...
src/ia32/full-codegen-ia32.cc:1138: ASSERT((var->is_global() && !var->is_this())
== (slot == NULL));
This was a silly typo, only present on the ia32 platform.

[Mads Ager (chromium), 2011-03-21 14:09:31]

LGTM