[clang] [clang] Extract `CompilerInstance` creation out of `compileModuleImpl()` (PR #134887)

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

Full details are available at: https://lab.llvm.org/buildbot/#/builders/3/builds/14412

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

```
Step 6 (test-build-unified-tree-check-all) failure: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
...
6.771 [56/18/5] Linking CXX executable tools/clang/unittests/AST/ByteCode/InterpTests
6.829 [55/18/6] Linking CXX executable tools/clang/unittests/CrossTU/CrossTUTests
7.018 [54/18/7] Linking CXX executable tools/clang/unittests/Analysis/ClangAnalysisTests
7.187 [53/18/8] Linking CXX executable tools/clang/unittests/libclang/libclangTests
7.339 [52/18/9] Linking CXX executable tools/clang/unittests/libclang/CrashTests/libclangCrashTests
7.351 [51/18/10] Linking CXX executable tools/clang/unittests/Rewrite/RewriteTests
7.687 [50/18/11] Linking CXX executable tools/clang/unittests/Analysis/FlowSensitive/ClangAnalysisFlowSensitiveTests
7.840 [49/18/12] Linking CXX executable tools/clang/unittests/InstallAPI/InstallAPITests
7.857 [48/18/13] Linking CXX executable tools/clang/unittests/ASTMatchers/Dynamic/DynamicASTMatchersTests
8.123 [47/18/14] Preparing lit tests
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=1208.882938

```

</details>

https://github.com/llvm/llvm-project/pull/134887