[clang] [llvm] [AArch64] Change feature dependencies of fp8 features (PR #122280)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-x86_64-debian-fast` running on `gribozavr4` while building `clang,llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/56/builds/16103

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

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'Clang :: Driver/print-enabled-extensions/aarch64-fujitsu-monaka.c' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: /b/1/clang-x86_64-debian-fast/llvm.obj/bin/clang --target=aarch64 --print-enabled-extensions -mcpu=fujitsu-monaka | /b/1/clang-x86_64-debian-fast/llvm.obj/bin/FileCheck --strict-whitespace --implicit-check-not=FEAT_ /b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Driver/print-enabled-extensions/aarch64-fujitsu-monaka.c
+ /b/1/clang-x86_64-debian-fast/llvm.obj/bin/clang --target=aarch64 --print-enabled-extensions -mcpu=fujitsu-monaka
+ /b/1/clang-x86_64-debian-fast/llvm.obj/bin/FileCheck --strict-whitespace --implicit-check-not=FEAT_ /b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Driver/print-enabled-extensions/aarch64-fujitsu-monaka.c
clang version 20.0.0git (https://github.com/llvm/llvm-project.git 7ed451a3f3f777966b05c51af920aa23fa1cd73e)
Target: aarch64
Thread model: posix
InstalledDir: /b/1/clang-x86_64-debian-fast/llvm.obj/bin
Build config: +assertions
/b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Driver/print-enabled-extensions/aarch64-fujitsu-monaka.c:31:20: error: CHECK-NEXT: expected string not found in input
// CHECK-NEXT:     FEAT_FP8DOT4                                           Enable FP8 4-way dot instructions
                   ^
<stdin>:27:93: note: scanning from here
    FEAT_FP8DOT2                                           Enable FP8 2-way dot instructions
                                                                                            ^
<stdin>:38:5: note: possible intended match here
    FEAT_LRCPC2                                            Enable Armv8.4-A RCPC instructions with Immediate Offsets
    ^

Input file: <stdin>
Check file: /b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Driver/print-enabled-extensions/aarch64-fujitsu-monaka.c

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

Input was:
<<<<<<
           .
           .
           .
          22:     FEAT_FGT                                               Enable fine grained virtualization traps extension 
          23:     FEAT_FHM                                               Enable FP16 FML instructions 
          24:     FEAT_FP                                                Enable Armv8.0-A Floating Point Extensions 
          25:     FEAT_FP16                                              Enable half-precision floating-point data processing 
          26:     FEAT_FP8                                               Enable FP8 instructions 
          27:     FEAT_FP8DOT2                                           Enable FP8 2-way dot instructions 
next:31'0                                                                                                 X error: no match found
          28:     FEAT_FPAC                                              Enable Armv8.3-A Pointer Authentication Faulting enhancement 
next:31'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          29:     FEAT_FRINTTS                                           Enable FRInt[32|64][Z|X] instructions that round a floating-point number to an integer (in FP format) forcing it to fit into a 32- or 64-bit int 
next:31'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          30:     FEAT_FlagM                                             Enable Armv8.4-A Flag Manipulation instructions 
next:31'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          31:     FEAT_FlagM2                                            Enable alternative NZCV format for floating point comparisons 
next:31'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          32:     FEAT_HBC                                               Enable Armv8.8-A Hinted Conditional Branches Extension 
next:31'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
...

```

</details>

https://github.com/llvm/llvm-project/pull/122280