Ahmed Bougacha d286efeb1d [AArch64][PAC] Lower direct authenticated calls to ptrauth constants. (#97664) ...

This tries to turn indirect ptrauth calls into direct calls, using
`ConstantPtrAuth::isKnownEquivalent` to compare the `ConstantPtrAuth`
target with the ptrauth call bundle.

This should be straightforward, other than the somewhat awkward GISel
handling, which has a handshake between CallLowering and IRTranslator to
elide the ptrauth when possible.

2024-07-15 16:14:43 -07:00

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