[llvm] [AMDGPU][MC] Don't crash on decoding invalid SOP1 ssrc0 operands. (PR #130302)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `openmp-offload-amdgpu-runtime-2` running on `rocm-worker-hw-02` while building `llvm` at step 8 "Add check check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/10/builds/868

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

```
Step 8 (Add check check-llvm) failure: test (failure)
******************** TEST 'LLVM-Unit :: Support/./SupportTests/135/175' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/unittests/Support/./SupportTests-LLVM-Unit-1542977-135-175.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=175 GTEST_SHARD_INDEX=135 /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/unittests/Support/./SupportTests
--

Script:
--
/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/unittests/Support/./SupportTests --gtest_filter=Caching.WriteAfterCommit
--
/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/llvm/unittests/Support/Caching.cpp:110: Failure
Value of: llvm::detail::TakeError(CFS->commit())
Expected: succeeded
  Actual: failed  (Failed to rename temporary file /tmp/lit-tmp-uog0grm2/llvm_test_cache/LLVMTest-fb811a.tmp.o to /tmp/lit-tmp-uog0grm2/llvm_test_cache/llvmcache-foo: No such file or directory
)


/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/llvm/unittests/Support/Caching.cpp:110
Value of: llvm::detail::TakeError(CFS->commit())
Expected: succeeded
  Actual: failed  (Failed to rename temporary file /tmp/lit-tmp-uog0grm2/llvm_test_cache/LLVMTest-fb811a.tmp.o to /tmp/lit-tmp-uog0grm2/llvm_test_cache/llvmcache-foo: No such file or directory
)



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


```

</details>

https://github.com/llvm/llvm-project/pull/130302