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[RegisterCoalescer] Fix reuse of instruction pointers #73519

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[RegisterCoalescer] Fix reuse of instruction pointers #73519

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Commits on Nov 27, 2023

  1. [RegisterCoalescer] Fix reuse of instruction pointers 

    If a pointer gets recycled while it is already in a work list, it can
cause duplicates in the work lists. In that case the same instruction
may be processed twice. If it is coalesced the first time, processing
it again would read deallocated memory. This is fixed by removing the
first occurrence from the work lists when we detect a pointer was
recycled.

Fixes llvm#71178
    @vvuksanovic
    vvuksanovic committed Nov 27, 2023
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