Revert "Reapply [clang-repl] [test] Make an XFAIL more precise (#70991)"

This reverts commit e9db60c0.
This was still failing (unexpectedly passing) on some Sony PS
buildbots.

The issue is that the clang-repl testcases don't depend on what
the default target triple is, but what the host triple is,
which is used for JIT purposes.