[clang] [Clang][CodeGen] Emit alignment information for indirect arguments (PR #201999)

[Sayan Sivakumaran via cfe-commits]

sivakusayan wrote:

Okay @efriedma-quic, should be ready. I updated:

- `clang/test/CodeGen/win-fp128.c`
- `clang/test/CodeGenHLSL/resources/cbuffer_struct_passing_with_resources.hlsl`
- `clang/test/CodeGenHLSL/resources/ConstantBufferT-struct-passing.hlsl`

The diff for commit `b4c2ce0` looks weird because I just used `--theirs` for the merge conflict, and updated the test afterwards. But the diff for `clang/test/CodeGen/win-fp128.c` should look normal now.

https://github.com/llvm/llvm-project/pull/201999