[clang] [llvm] Remove Native Client support (PR #133661)

[Brad Smith via llvm-commits]

brad0 wrote:

@MaskRay Another thing I wanted to ask about was there were some tests I removed with nacl in the name that used nacl triples as well as rodata-section.s. I am not sure if any of them are still relevant outside of a nacl environment. Should they be renamed and use a different triple or any other changes?

https://github.com/llvm/llvm-project/pull/133661