Mark cctest/test-alloc/CodeRange as flaky on Windows

BUG=v8:3005
LOG=N
R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/65833003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17771 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix missing type feedback check for Generic*String addition.

TEST=mjsunit/regress/regress-crbug-318671
BUG=318671
LOG=y
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/67473007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17772 ce2b1a6d-e550-0410-aec6-3dcde31c8c00