Split scripts for ELF and UCLIBC regression tests. Add options to allow testing either or both.

2013-01-10  Jeremy Bennett <jeremy.bennett@embecosm.com>

	* arc-init.sh (run_check, save_res): move functions to run tests
	and process results to this script. Clean up recording of results.
	* run-elf32-tests.sh, run-uclibc-tests.sh: New scripts
	incorporating target specific code from run-tests.sh.
	* run-tests.sh: split ELF and Linux tests out into their own
	scripts. Add options to allow just one or the other to be run.