[clang] [AArch64] Add missing Neon Types (PR #126945)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `openmp-offload-amdgpu-runtime-2` running on `rocm-worker-hw-02` while building `clang` at step 7 "Add check check-clang".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/10/builds/6505

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

```
Step 7 (Add check check-clang) failure: test (failure)
******************** TEST 'Clang :: CodeGen/AArch64/mixed-neon-types.c' FAILED ********************
Exit Code: 2

Command Output (stderr):
--
/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/clang -cc1 -internal-isystem /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/lib/clang/21/include -nostdsysteminc  -triple aarch64-linux-gnu -target-feature +neon -x c /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/CodeGen/AArch64/mixed-neon-types.c -emit-llvm -o - | /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/FileCheck /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/CodeGen/AArch64/mixed-neon-types.c --check-prefix=CHECK-C # RUN: at line 2
+ /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/clang -cc1 -internal-isystem /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/lib/clang/21/include -nostdsysteminc -triple aarch64-linux-gnu -target-feature +neon -x c /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/CodeGen/AArch64/mixed-neon-types.c -emit-llvm -o -
+ /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/FileCheck /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/CodeGen/AArch64/mixed-neon-types.c --check-prefix=CHECK-C
/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/CodeGen/AArch64/mixed-neon-types.c:27:10: fatal error: 'arm_neon.h' file not found
   27 | #include <arm_neon.h>
      |          ^~~~~~~~~~~~
1 error generated.
FileCheck error: '<stdin>' is empty.
FileCheck command line:  /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/FileCheck /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/clang/test/CodeGen/AArch64/mixed-neon-types.c --check-prefix=CHECK-C

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/126945