Michael Gottesman 5f69bf583c [semantic-arc] Ignore type dependent uses when using a worklist to check for writes. ...

Otherwise, we hit misc crashes. The worklist should have always been filtering
these. I wonder why we have never hit this issue before.

I added a new API that filters out type dependent uses called
ValueBase::getNonTypeDependentUses() to make it easier to perform def->use
worklist traversal ignoring these uses. This mirrors the APIs that we have
created for filtering type dependent operands when performing use->def worklist
traversal.

I also noticed that we are not eliminating a load [copy] that we could in the
test case. I am going to file a separate bug report for that work.

rdar://79781943

2021-07-07 16:00:14 -07:00

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