[PATCH] Combine bit test + conditional or into simple math

[David Majnemer]

This patch simplifies constructs like:

(select (icmp eq (and X, C1), 0), Y, (or Y, C2))

into:

(or (shl (and X, C1), C3), y)

where C3 = Log(C2) - Log(C1)

It includes quite a number of test cases and successfully runs 'make check'
cleanly against r179493.

Thanks
-- 
David Majnemer
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