[clang] [compiler-rt] [XRay][AArch64] Support -fxray-shared (PR #114431)

[Julian Nagele via cfe-commits]

juliannagele wrote:

Unfortunately it looks like this has broken building compiler-rt on green dragon:
https://green.lab.llvm.org/job/llvm.org/job/clang-stage1-RA/2606/console
```
<instantiation>:1:1: error: unrecognized instruction mnemonic
pushfq
^
/Users/ec2-user/jenkins/workspace/llvm.org/clang-stage1-RA/llvm-project/compiler-rt/lib/xray/xray_trampoline_x86_64.S:129:2: note: while in macro instantiation
 SAVE_REGISTERS
 ^
...
```

https://github.com/llvm/llvm-project/pull/114431