Teresa Johnson c1b3e88844 [LTO/WPD] Allow devirtualization to function alias in vtable ...

Follow on to D144209 to support single implementation devirtualization
for Regular LTO when the vtable holds a function alias.

For now I have prevented other optimizations performed in regular LTO
that need to analyze the contents of the function target when the vtable
holds an alias, as I'm not sure they are always correct to perform in
that case.

Differential Revision: https://reviews.llvm.org/D144270

2023-02-23 14:04:05 -08:00

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