[clang] [CIR][AArch64] Upstream widening-addition and vector-shift-left-and-widen NEON builtins (PR #204285)

[Andrzej Warzyński via cfe-commits]

https://github.com/banach-space approved this pull request.

LGTM % comment from @E00N777 , thank you!

https://github.com/llvm/llvm-project/pull/204285