Michael Gottesman a70733c222
[loadable-by-address] Update debug variable type when rewriting alloc_stack ...
The LoadableByAddress pass rewrites alloc_stack instructions when their element
type changes (e.g., a function parameter convention changes from @guaranteed to
@in_guaranteed for large/opaque types). However, it was passing the original
SILDebugVariable info through unchanged. When the VarInfo has an explicit Type
field set this creates a mismatch between the SSA type and the debug type,
causing a SIL verifier failure.
In this patch, I just change the pass to update the alloc_stack as
appropriate. I verified that this cannot happen with debug_value since we do not
store the extra type info in it if we have an object typed thing. Since
loadable_by_address only changes objects -> addresses, it can never happen.
rdar://164268891
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a70733c222