[clang] [Clang] VectorExprEvaluator::VisitCallExpr / InterpretBuiltin - Allow GFNI intrinsics to be used in constexpr (PR #169619)

[NagaChaitanya Vellanki via cfe-commits]

chaitanyav wrote:

Also, all tests passed on my machine
```
╭  ~/llvm-project   issue_169295 ⍟1                                                                                                 ✔  3023  23:38:23
╰─ ninja -C build check-clang
ninja: Entering directory `build'
[307/308] Running the Clang regression tests
llvm-lit: /home/naga/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using clang: /home/naga/llvm-project/build/bin/clang
llvm-lit: /home/naga/llvm-project/llvm/utils/lit/lit/llvm/subst.py:126: note: Did not find cir-opt in /home/naga/llvm-project/build/bin:/home/naga/llvm-project/build/bin
llvm-lit: /home/naga/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using ld.lld: /home/naga/llvm-project/build/bin/ld.lld
llvm-lit: /home/naga/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using lld-link: /home/naga/llvm-project/build/bin/lld-link
llvm-lit: /home/naga/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using ld64.lld: /home/naga/llvm-project/build/bin/ld64.lld
llvm-lit: /home/naga/llvm-project/llvm/utils/lit/lit/llvm/config.py:564: note: using wasm-ld: /home/naga/llvm-project/build/bin/wasm-ld

Testing Time: 183.35s

Total Discovered Tests: 49155
  Skipped          :     6 (0.01%)
  Unsupported      :  4969 (10.11%)
  Passed           : 44154 (89.83%)
  Expectedly Failed:    26 (0.05%)
```

I will work on the runtime vs compile time results comparison and post it here.

https://github.com/llvm/llvm-project/pull/169619