Take into account zero-offset field sequences when propagating locals #64701
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Tagging subscribers to this area: @JulieLeeMSFT Issue DetailsUsing tree VNs runs into the problem described in #64700. We're expecting some small number of diffs from more/fewer propagations. Fixes #64700. Also should fix the
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LCL_VAR use VN != VN of its SSA def. Using one for replacement can run afoul of substituting into a LCL_VAR that has a zero-offset field sequence on top and thus duplicate the sequence (as the replacement def will already have this sequence incorporated into its VN).
Just one diff, missing null check elimination: we propagated a field sequence for an array address (PtrToArrElem) that later wasn't recognized as implying non-nullness of another PtrToArrElem to the same array.
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jakobbotsch
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Not doing so runs into the problem described in #64700.
Some small number of diffs from more/fewer propagations.
Fixes #64700.
Fixes #64761.