[NFC] [clang-repl] Fix test failures due to incosistent target settings

See https://github.com/llvm/llvm-project/pull/79261 for details.

It shows that clang-repl uses a different target triple with clang so that it
may be problematic if the calng-repl reads the generated BMI from clang
in a different target triple.

While the underlying issue is not easy to fix, this patch tries to make
this test green to not bother developers.