Add noxfail option to run_dump_test

Add noxfail option to run_dump_test

The noxfail option is useful in situations like pr23658-1e which
fails on all microblaze ELF targets except microblaze-linux.  This was
possible to handle by writing a small proc and use that as an xfail
predicate, or painstakingly listing all microblaze ELF targets, but
this is simpler.  The patch also fixes some other FAILs and XPASSes of
the pr23658 tests.

binutils/
	* testsuite/lib/binutils-common.exp (run_dump_test): Support
	noxfail.
ld/
	* testsuite/ld-elf/pr23658-1a.d: Don't xfail m68hc12.
	* testsuite/ld-elf/pr23658-1e.d: Likewise.  xfail xstormy16
	and correct microblaze xfails.