Sanjay Patel 3b8ae1001f [InstCombine] fix miscompile from umul_with_overflow matching ...

As noted in PR46561:
https://bugs.llvm.org/show_bug.cgi?id=46561
...it takes something beyond a minimal IR example to trigger
this bug because it relies on matching non-canonical IR.

There are no tests that show the need for matching this
pattern, so I'm just deleting it to fix the miscompile.

2020-07-04 11:16:23 -04:00

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