[PATCH] Moar string interceptors: strstr, strcasestr, strcspn, strpbrk

[Maria Guseva]

Submitted first separate patch:  New "strict_string_checks" run-time flag http://reviews.llvm.org/D7123
The second one(new interceptors) depends on this so I'll submit it when the first review passed.


http://reviews.llvm.org/D6056

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