[llvm] [Intrinsic] Unify IIT_STRUCT{2-9} into ITT_STRUCT to support upto 257 return value (PR #160434)

[Rahul Joshi via llvm-commits]

https://github.com/jurahul approved this pull request.

LGTM, thanks for iterating through the feedback.

https://github.com/llvm/llvm-project/pull/160434