Simplify CFG before experiment flush
Simplify CFG before experiment flush

Summary: The inliner may generate unreachable blocks. An example is inlining of unconditionally `throw`ing code. Simplify the work of experiment contexts and call `simplify` to remove unreachable blocks.

Reviewed By: kuganv

Differential Revision: D25740471

fbshipit-source-id: 8322b0c3a177f68948a0c4a277fc6ccbe746e0fb

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