[clang] [Clang][Sema] Extend test coverage for SVE/SME builtin usage. (PR #156908)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ppc64le-lld-multistage-test` running on `ppc64le-lld-multistage-test` while building `clang` at step 13 "test-build-stage2-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/168/builds/16551

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 13 (test-build-stage2-unified-tree-check-all) failure: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
805.965 [1/2/1] Preparing lit tests
command timed out: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=2006.850887

```

</details>

https://github.com/llvm/llvm-project/pull/156908