Ahmed Bougacha 2eb6e30fe8 [clang] Wire -fptrauth-returns to "ptrauth-returns" fn attribute. (#102416) ...

We already ended up with -fptrauth-returns, the feature macro, the lang
opt, and the actual backend lowering.

The only part left is threading it all through PointerAuthOptions, to
drive the addition of the "ptrauth-returns" attribute to generated
functions.
While there, do minor cleanup on ptrauth-function-attributes.c.

This also adds ptrauth_key_return_address to ptrauth.h.

2024-08-09 11:49:50 -07:00

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