Fix --trace-ic position information for LoadICs and StoreICs in optimized code

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/352663002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22008 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Drop obsolete dont_optimize compiler hint.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/354813003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22009 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Blacklist failing test from GC stress runs.

The test expects a function not to deopt. However GC stress causes
the code to be marked for deopt for a reason we are not testing against.

R=marja@chromium.org

Review URL: https://codereview.chromium.org/354853002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22010 ce2b1a6d-e550-0410-aec6-3dcde31c8c00