[llvm] Added const reference for params wth size >= 16 bytes (PR #125074)

[Jessica Clarke via llvm-commits]

jrtc27 wrote:

Also, for types that come from other libraries (libc, STL, or other third-party ones), their sizes may vary. For example, FreeBSD's pthread_mutex_t is a pointer to the real data, whilst GNU/Linux's is the struct itself. How are we deciding which to use? Do we go with the biggest or the smallest?

https://github.com/llvm/llvm-project/pull/125074