[clang] [llvm] [AArch64] Make +pauth enabled in Armv8.3-a by default (PR #78027)

[David Spickett via llvm-commits]

DavidSpickett wrote:

Just for citations here, the A profile manual says:
FEAT_PAuth is mandatory in Armv8.3 implementations.

The R Profile manual says:
The Armv8-R AArch64 architecture supports FEAT_PAuth2 feature defined in Armv8-A architecture with a
modified definition of PAC field as described below...

So the overall intent is correct.

https://github.com/llvm/llvm-project/pull/78027