[InstCombine] Do not exercise nested max/min pattern on abs
Summary:
This is a fix for assertion failure in
`getInverseMinMaxSelectPattern` when ABS is passed in as a select pattern.
We should not be invoking the simplification rule for
ABS(MIN(~ x,y))) or ABS(MAX(~x,y)) combinations.
Added a test case which would cause an assertion failure without the patch.
Reviewers: sanjoy, majnemer
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D30051
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295719
91177308-0d34-0410-b5e6-
96231b3b80d8
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