[clang] [HLSL] Codegen for passing cbuffer structs as function args (PR #203961)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ppc64le-flang-rhel-clang` running on `ppc64le-flang-rhel-test` while building `clang` at step 6 "test-build-unified-tree-check-flang".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/157/builds/47563

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

```
Step 6 (test-build-unified-tree-check-flang) failure: 1200 seconds without output running [b'ninja', b'check-flang'], attempting to kill
...
PASS: Flang :: Driver/fveclib.f90 (4592 of 4602)
PASS: Flang :: Transforms/tbaa-local-alloc-threshold.fir (4593 of 4602)
PASS: Flang :: Driver/options-loongarch.f90 (4594 of 4602)
PASS: Flang :: Transforms/debug-dwarf-version.fir (4595 of 4602)
PASS: Flang :: Semantics/numeric_storage_size.f90 (4596 of 4602)
PASS: Flang :: Driver/fopenmp.f90 (4597 of 4602)
PASS: Flang :: Transforms/vscale-attr.fir (4598 of 4602)
PASS: flang-Unit :: Optimizer/./FlangOptimizerTests/165/168 (4599 of 4602)
PASS: Flang :: Driver/linker-options.f90 (4600 of 4602)
PASS: Flang :: Driver/omp-driver-offload.f90 (4601 of 4602)
command timed out: 1200 seconds without output running [b'ninja', b'check-flang'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=2497.041099

```

</details>

https://github.com/llvm/llvm-project/pull/203961