[clang] [Clang] Permit noescape on non-pointer types (PR #117344)

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

I'm not sure I understand the intended meaning here.  Is noescape on a struct argument supposed to recursively apply to every pointer field of the struct?  If that's the intended meaning, should we restrict this to structs that have pointer fields?

https://github.com/llvm/llvm-project/pull/117344