[llvm] [AMDGPU] Mark workgroup_id intrinsics always uniform (PR #102042)

[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 `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/56/builds/4147

Here is the relevant piece of the build log for the reference:
```
Step 6 (test-build-unified-tree-check-all) failure: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
...
PASS: lit :: selecting.py (79474 of 79484)
PASS: lit :: shtest-external-shell-kill.py (79475 of 79484)
PASS: lit :: googletest-timeout.py (79476 of 79484)
PASS: lit :: shtest-timeout.py (79477 of 79484)
PASS: lit :: shtest-define.py (79478 of 79484)
PASS: lit :: shtest-shell.py (79479 of 79484)
PASS: LLVM-Unit :: Support/./SupportTests/128/172 (79480 of 79484)
PASS: lit :: max-time.py (79481 of 79484)
PASS: LLVM-Unit :: Support/./SupportTests/126/172 (79482 of 79484)
PASS: LLVM :: tools/llvm-reduce/parallel-workitem-kill.ll (79483 of 79484)
command timed out: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1374.663243

```

https://github.com/llvm/llvm-project/pull/102042