[clang] [mlir] [CIR] Set `builtin` attribute for new and delete calls (PR #184920)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

There are 2 more tests for MLIR that need to happen, see Dialect/LLVMIR/func.mlir and target/LLVMIR/Import/function-attributes.ll I think (that will fill out the list of ones that ended up getting full coverage for me!).

I THINK that becasue of this you're missing some of the changes to ModuleTranslation.cpp/h.

See: https://github.com/llvm/llvm-project/commit/8cf99c263ef9099e58c7143de3c611190cb556ed

https://github.com/llvm/llvm-project/pull/184920