[runtimes] Simplify how we specify XFAIL & friends based on the triple

Now that Lit supports regular expressions inside XFAIL & friends, it is
much easier to write Lit annotations based on the triple.

Differential Revision: https://reviews.llvm.org/D104747

GitOrigin-RevId: c360553c15a8e5aa94d2236eb73e7dfeab9543e5
16 files changed