[clang] [Clang] Set the FTM for trivial relocation (PR #142936)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

This has been in the tree for less than a month and we've not had a release out to the public with it yet, right? That seems a bit premature if we were waiting for some user experience before flipping the switch. I don't have a good intuition for how much use these facilities have gotten so far.

If @ldionne thinks this makes his life (or other standard libraries) easier though, it maybe be reasonable.

https://github.com/llvm/llvm-project/pull/142936