Different combinations of CodeType and JSParserStrictness could generate same m_flags value because the value of CodeType and the value of JSParserStrictness shares a bit inside m_flags member variable. Shift the value of CodeType one bit farther to the left so those values don't overlap.
Created attachment 234059 [details] patch
Comment on attachment 234059 [details] patch Attachment 234059 [details] did not pass mac-wk2-ews (mac-wk2): Output: http://webkit-queues.appspot.com/results/5121769715269632 New failing tests: media/W3C/video/networkState/networkState_during_loadstart.html
Created attachment 234242 [details] Archive of layout-test-results from webkit-ews-13 for mac-mountainlion-wk2 The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews. Bot: webkit-ews-13 Port: mac-mountainlion-wk2 Platform: Mac OS X 10.8.5
Created attachment 234302 [details] updated patch
Comment on attachment 234302 [details] updated patch Attachment 234302 [details] did not pass mac-wk2-ews (mac-wk2): Output: http://webkit-queues.appspot.com/results/5749145654525952 New failing tests: media/W3C/video/networkState/networkState_during_loadstart.html
Created attachment 234314 [details] Archive of layout-test-results from webkit-ews-09 for mac-mountainlion-wk2 The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews. Bot: webkit-ews-09 Port: mac-mountainlion-wk2 Platform: Mac OS X 10.8.5
Created attachment 234391 [details] updated patch
Comment on attachment 234391 [details] updated patch Attachment 234391 [details] did not pass mac-wk2-ews (mac-wk2): Output: http://webkit-queues.appspot.com/results/5170155071995904 New failing tests: media/W3C/video/networkState/networkState_during_loadstart.html
Created attachment 234392 [details] Archive of layout-test-results from webkit-ews-10 for mac-mountainlion-wk2 The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews. Bot: webkit-ews-10 Port: mac-mountainlion-wk2 Platform: Mac OS X 10.8.5
Comment on attachment 234391 [details] updated patch Clearing flags on attachment: 234391 Committed r170834: <http://trac.webkit.org/changeset/170834>
All reviewed patches have been landed. Closing bug.
Can you add a regression test for this?