Allow blanket keep to be negated by allowobfuscation rules
Allow blanket keep to be negated by allowobfuscation rules

Summary:
Deal with allowobfuscation for blanket keep negation
redexstats[fb4a_stats,fb4a_unstable]

Reviewed By: dariorussi

Differential Revision: D4337970

fbshipit-source-id: ab6c4366dbef303562cd733b5128b5e3b8f83da6

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex