[compiler-rt] [compiler-rt][SME] Correct .variant_pcs directives. (PR #103047)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-x86_64-linux-abi-test` running on `sie-linux-worker2` while building `compiler-rt` at step 2 "Checkout test-suite".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/8/builds/3114

Here is the relevant piece of the build log for the reference:
```
Step 2 (Checkout test-suite) failure: update (failure)
git version 2.34.1
fatal: unable to access 'https://github.com/llvm/llvm-test-suite.git/': Could not resolve host: github.com
fatal: unable to access 'https://github.com/llvm/llvm-test-suite.git/': Could not resolve host: github.com

```

https://github.com/llvm/llvm-project/pull/103047