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

[Corentin Jabot via cfe-commits]

cor3ntin wrote:

@EricWF we decided to hold off (we keep finding monor issues so it needs more backing) - can you use either the major clang version or __has_builtin as a discriminant for the time being?

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