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Matthias Krüger
3075644a3d
Unconditionally allow shadow call-stack sanitizer for AArch64 It is possible to do so whenever `-Z fixed-x18` is applied. cc ``@Darksonn`` for context The reasoning is that, as soon as reservation on `x18` is forced through the flag `fixed-x18`, on AArch64 the option to instrument with [Shadow Call Stack sanitizer](https://clang.llvm.org/docs/ShadowCallStack.html) is then applicable regardless of the target configuration. At the every least, we would like to relax the restriction on specifically `aarch64-unknonw-none`. For this option, we can include a documentation change saying that users of compiled objects need to ensure that they are linked to runtime with Shadow Call Stack instrumentation support. Related: #121972