[clang] [flang] [llvm] [AArch64] Add ability to list extensions enabled for a target (PR #95805)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

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

Full details are available at: https://lab.llvm.org/buildbot/#/builders/3/builds/630

Here is the relevant piece of the build log for the reference:
```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'Clang :: Driver/aarch64-v81a.c' FAILED ********************
Exit Code: 2

Command Output (stderr):
--
RUN: at line 1: /buildbot/worker/arc-folder/build/bin/clang --target=aarch64_be -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A-BE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=aarch64_be -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A-BE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
RUN: at line 2: /buildbot/worker/arc-folder/build/bin/clang --target=aarch64_be -march=armv8.1-a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A-BE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A-BE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=aarch64_be -march=armv8.1-a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
RUN: at line 3: /buildbot/worker/arc-folder/build/bin/clang --target=aarch64 -mbig-endian -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A-BE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A-BE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=aarch64 -mbig-endian -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
RUN: at line 4: /buildbot/worker/arc-folder/build/bin/clang --target=aarch64 -mbig-endian -march=armv8.1-a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A-BE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A-BE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=aarch64 -mbig-endian -march=armv8.1-a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
RUN: at line 5: /buildbot/worker/arc-folder/build/bin/clang --target=aarch64_be -mbig-endian -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A-BE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=aarch64_be -mbig-endian -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A-BE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
RUN: at line 6: /buildbot/worker/arc-folder/build/bin/clang --target=aarch64_be -mbig-endian -march=armv8.1-a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A-BE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A-BE /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=aarch64_be -mbig-endian -march=armv8.1-a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
RUN: at line 9: /buildbot/worker/arc-folder/build/bin/clang --target=aarch64 -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=aarch64 -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
RUN: at line 10: /buildbot/worker/arc-folder/build/bin/clang --target=aarch64 -march=armv8.1-a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=aarch64 -march=armv8.1-a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
RUN: at line 11: /buildbot/worker/arc-folder/build/bin/clang --target=aarch64 -mlittle-endian -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=aarch64 -mlittle-endian -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
RUN: at line 12: /buildbot/worker/arc-folder/build/bin/clang --target=aarch64 -mlittle-endian -march=armv8.1-a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=aarch64 -mlittle-endian -march=armv8.1-a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
RUN: at line 13: /buildbot/worker/arc-folder/build/bin/clang --target=aarch64_be -mlittle-endian -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=aarch64_be -mlittle-endian -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
RUN: at line 14: /buildbot/worker/arc-folder/build/bin/clang --target=aarch64_be -mlittle-endian -march=armv8.1-a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=aarch64_be -mlittle-endian -march=armv8.1-a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
RUN: at line 17: /buildbot/worker/arc-folder/build/bin/clang --target=arm64 -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=ARM64-GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=arm64 -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=ARM64-GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
RUN: at line 18: /buildbot/worker/arc-folder/build/bin/clang --target=arm64 -march=armv8.1-a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=ARM64-GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=arm64 -march=armv8.1-a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=ARM64-GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
RUN: at line 19: /buildbot/worker/arc-folder/build/bin/clang --target=arm64 -mlittle-endian -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c 2>&1 | /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=ARM64-GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/FileCheck -check-prefix=ARM64-GENERICV81A /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
+ /buildbot/worker/arc-folder/build/bin/clang --target=arm64 -mlittle-endian -march=armv8.1a -### -c /buildbot/worker/arc-folder/llvm-project/clang/test/Driver/aarch64-v81a.c
...

```

https://github.com/llvm/llvm-project/pull/95805