[qt/clang/llvm]: Summary of bulk changes made

Git repository change summary for qt/clang/llvm
Pushed by mirror-service into branch 'upstream/users/kovdan01/ptrauth-atts-for-synthetic-fns'.
Changed from 0000000000000000000000000000000000000000 to 34e6a709f07ca0f7bce8fb8896da0a2585db36d3
Acknowledgement was received that this change introduces only existing code that has been pushed to another public open source repository.

This change contains the following new commits:

Git commit 34e6a709f07ca0f7bce8fb8896da0a2585db36d3 by Daniil Kovalev on 21/07/2026 at 14:49..
[clang][AArch64] Set hardening fn attrs on synthetic functions

Compiler-synthesized functions such as `__llvm_gcov_writeout`,
`__llvm_gcov_reset` and `__llvm_gcov_init` were previously never receiving the
AArch64 hardening function attributes (ptrauth-returns, ptrauth-auth-traps,
ptrauth-indirect-gotos and aarch64-jump-table-hardening) since the
attributes were only emitted by Clang and gated by `PointerAuthOptions`
structure's corresponding fields. See `setPointerAuthFnAttributes` and
`initPointerAuthFnAttributes` member functions of `TargetCodeGenInfo`.

This patch resolves this in the same manner as #83153 does for several
other attributes. Particularly, Clang now emits corresponding 4 module
flags (conditionally on whether the related feature is enabled) with Max
behavior, and LLVM's `Function::createWithDefaultAttr` derives the matching
function attributes from them. Max behavior with conditional emission is
safe because none of these features affect ABI, so promoting an absent
flag on module merge cannot break compatibility.
https://invent.kde.org/qt/clang/llvm/-/commit/34e6a709f07ca0f7bce8fb8896da0a2585db36d3