[clang] [CLANG][AArch64] Add the modal 8 bit floating-point scalar type (PR #97277)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-m68k-linux-cross` running on `suse-gary-m68k-cross` while building `clang` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/27/builds/1021

<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 'Clang :: CodeGen/aarch64-debug-types.c' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 1: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/clang -cc1 -internal-isystem /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/lib/clang/20/include -nostdsysteminc -triple aarch64-none-linux-gnu -target-feature +neon  -target-feature +fp8   -emit-llvm -o - /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/test/CodeGen/aarch64-debug-types.c -debug-info-kind=limited 2>&1 | /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/test/CodeGen/aarch64-debug-types.c
+ /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/clang -cc1 -internal-isystem /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/lib/clang/20/include -nostdsysteminc -triple aarch64-none-linux-gnu -target-feature +neon -target-feature +fp8 -emit-llvm -o - /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/test/CodeGen/aarch64-debug-types.c -debug-info-kind=limited
+ /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/stage1/bin/FileCheck /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/test/CodeGen/aarch64-debug-types.c
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/test/CodeGen/aarch64-debug-types.c:6:16: error: CHECK-DAG: expected string not found in input
 // CHECK-DAG: !DIDerivedType(tag: DW_TAG_typedef, name: "__MFloat8_t", {{.*}}, baseType: ![[ELTTYU8:[0-9]+]]
               ^
<stdin>:1:1: note: scanning from here
/var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/test/CodeGen/aarch64-debug-types.c:3:9: fatal error: 'arm_neon.h' file not found
^

Input file: <stdin>
Check file: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/test/CodeGen/aarch64-debug-types.c

-dump-input=help explains the following input dump.

Input was:
<<<<<<
       1: /var/lib/buildbot/workers/suse-gary-m68k-cross/clang-m68k-linux-cross/llvm/clang/test/CodeGen/aarch64-debug-types.c:3:9: fatal error: 'arm_neon.h' file not found 
dag:6     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
       2:  3 | #include<arm_neon.h> 
dag:6     ~~~~~~~~~~~~~~~~~~~~~~~~~~
       3:  | ^~~~~~~~~~~~ 
dag:6     ~~~~~~~~~~~~~~~~
       4: 1 error generated. 
dag:6     ~~~~~~~~~~~~~~~~~~~
>>>>>>

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/97277