Flags value of SourceCodeKey should be unique for each case.
https://bugs.webkit.org/show_bug.cgi?id=134435

Patch by Daewoong Jang <daewoong.jang@navercorp.com> on 2014-07-06
Reviewed by Darin Adler.

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.

* runtime/CodeCache.h:
(JSC::SourceCodeKey::SourceCodeKey):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@170834 268f45cc-cd09-0410-ab3c-d52691b4dbfc