[compiler-rt] [compiler-rt] Fix amdgcn -> amdgpu conversion for compiler-rt (PR #209765)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-ppc64le-linux-multistage` running on `ppc64le-clang-multistage-test` while building `compiler-rt` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/76/builds/15073

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

```
Step 5 (ninja check 1) failure: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
...
PASS: Clang :: Driver/sanitizer-ld.c (112984 of 112994)
PASS: LLVM :: tools/llvm-objdump/ELF/AMDGPU/subtarget.ll (112985 of 112994)
PASS: Clang :: Driver/x86-target-features.c (112986 of 112994)
PASS: Clang :: Preprocessor/arm-target-features.c (112987 of 112994)
PASS: Clang :: Driver/cl-options.c (112988 of 112994)
PASS: Clang :: Driver/clang_f_opts.c (112989 of 112994)
PASS: Clang :: Driver/arm-cortex-cpus-2.c (112990 of 112994)
PASS: Clang :: Driver/fsanitize.c (112991 of 112994)
PASS: Clang :: Preprocessor/predefined-arch-macros.c (112992 of 112994)
PASS: ScudoStandalone-Unit :: ./ScudoUnitTest-powerpc64le-Test/99/387 (112993 of 112994)
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=8903.393254

```

</details>

https://github.com/llvm/llvm-project/pull/209765