linux: fix uClibc ifdeffery

Remove duplicate inclusion of execinfo.h and make OS::DumpBacktrace
a NOOP on uclibc.

Review URL: https://codereview.chromium.org/13071007
Patch from Mostyn Bramley-Moore <mostynb@opera.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14172 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Always check global property cells for readonliness before storing.
Add check when the global object is the last in the chain.

Review URL: https://chromiumcodereview.appspot.com/13730002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14173 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Adding standard-compliance tests for array functions.

BUG=v8:2615

Review URL: https://chromiumcodereview.appspot.com/13601009

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14174 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix slow path of JSON.stringifier when GC strikes.

FlatContent is not GC-safe.

R=verwaest@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/13782002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14175 ce2b1a6d-e550-0410-aec6-3dcde31c8c00