Michael Liao 1fd1f638b6 [amdgpu] Fix a crash case when V_CNDMASK could be simplified.
- Once an instruction is simplified, foldable candidates from it should
  be invalidated or skipped as the operand index is no longer valid.

Differential Revision: https://reviews.llvm.org/D93174
2020-12-14 13:08:13 -05:00
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