[libcxx] [llvm] [ASan][libc++] Turn on ASan annotations for short strings (PR #79049)

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

> > > the llvm changes should probably be landed separately.
> > 
> > 
> > Those changes are strongly related to that PR and don't affect behavior there (only affect ASan annotations), therefore I included them in one PR, but I can open a separate one soon (and move there this one commit).
> 
> To me they are dependency of the main PR, but don't need to be here. so +1 for a separate PR

Actually two PRs, JSON and ADT are also intependent.

https://github.com/llvm/llvm-project/pull/79049