[clang] [Clang][ARM] Fix tests using thumb instead arm arch on cc1 (PR #166416)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ppc64le-lld-multistage-test` running on `ppc64le-lld-multistage-test` while building `clang` at step 12 "build-stage2-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/168/builds/16884

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

```
Step 12 (build-stage2-unified-tree) failure: build (failure) (timed out)
...
1179.186 [57/10/6701] Linking CXX executable bin/lld
1179.284 [57/9/6702] Linking CXX executable tools/lld/unittests/AsLibAll/LLDAsLibAllTests
1179.346 [57/8/6703] Linking CXX executable unittests/MIR/MIRTests
1179.586 [57/7/6704] Linking CXX executable unittests/CodeGen/CGPluginTest/CGPluginTest
1180.336 [57/6/6705] Linking CXX executable bin/llvm-opt-fuzzer
1180.425 [57/5/6706] Linking CXX executable bin/dsymutil
1180.489 [57/4/6707] Linking CXX executable bin/llvm-isel-fuzzer
1180.798 [57/3/6708] Linking CXX executable unittests/CodeGen/CodeGenTests
1218.197 [57/2/6709] Building CXX object tools/bugpoint-passes/CMakeFiles/BugpointPasses.dir/TestPasses.cpp.o
1218.813 [56/2/6710] Linking CXX shared module lib/BugpointPasses.so
command timed out: 1200 seconds without output running [b'ninja'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=2419.409714

```

</details>

https://github.com/llvm/llvm-project/pull/166416