[llvm] Adding support in llvm-exegesis for Aarch64 for handling FPR64/128, PPR16 and ZPR128 reg class. (PR #127564)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-aarch64-quick` running on `linaro-clang-aarch64-quick` while building `llvm` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/65/builds/13279

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

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: tools/llvm-exegesis/AArch64/setReg_init_check.s' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
llvm-exegesis error: benchmarking unavailable, LLVM was built without libpfm. You can pass --benchmark-phase=... to skip the actual benchmarking or --use-dummy-perf-counters to not query the kernel for real event counts.

--
Command Output (stderr):
--
RUN: at line 6: /home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/bin/llvm-exegesis -mcpu=neoverse-v2 -mode=latency --dump-object-to-disk=%d --opcode-name=FADDV_VPZ_D 2>&1
+ /home/tcwg-buildbot/worker/clang-aarch64-quick/stage1/bin/llvm-exegesis -mcpu=neoverse-v2 -mode=latency --dump-object-to-disk=%d --opcode-name=FADDV_VPZ_D

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/127564