[AMDGPU] Prevent re-visits in LowerBufferFatPointers (#159168) Fixes https://github.com/iree-org/iree/issues/22001 The visitor in SplitPtrStructs would re-visit instructions if an instruction earlier in program order caused a recursive visit() call via getPtrParts(). This would cause instructions to be processed multiple times. As a consequence of this, PHI nodes could be added to the Conditionals array multiple times, which would to a conditinoal that was already simplified being processed multiple times. After the code moved to InstSimplifyFolder, this re-processing, combined with more agressive simplifications, would lead to an attempt to replace an instruction with itself, causing an assertion failure and crash. This commit resolves the issue and adds the reduced form of the crashing input as a test.
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