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Teach computeKnownBits to look through returned-argument functions

Authored by hfinkel on Jul 10 2016, 7:25 PM.

Description

Teach computeKnownBits to look through returned-argument functions

If a function is known to return one of its arguments, we can use that in order
to compute known bits of the return value.

Differential Revision: http://reviews.llvm.org/D9397

llvm-svn: 275036

Details