[clang] Use a specific target when testing that `-fomit-frame-pointer` and `-pg` are mutually exclusive (#148000)
Some targets, such as `aarch64-pc-windows-msvc`, always require that
Frame Pointer be reserved even when `-fomit-frame-pointer` is provided,
thus it is always valid to use `-pg` on those targets.
This test didn't take these targets into account; thus it was failing on
Arm64 Windows host machines.
The fix is to explicitly set a target that doesn't require Frame
Pointers reservation.