Noah Goldstein 4fcfff4f2d Use analyzeKnownBitsFromAndXorOr in SimplifyDemandedUseBits for and/xor/or
There are extra patterns that have for these three logic operations
that aren't covered in `SimplifyDemandedUseBits`. To avoid duplicating
the code, just use `analyzeKnownBitsFromAndXorOr` in
`SimplifyDemandedUseBits` to get full coverage.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D142429
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This directory contains test cases for the instcombine transformation.  The
dated tests are actual bug tests, whereas the named tests are used to test
for features that the this pass should be capable of performing.