CRIS: Adjust gcc.dg/tree-ssa/loop-1.c

CRIS: Adjust gcc.dg/tree-ssa/loop-1.c

With r15-1619-g3b9b8d6cfdf593, there's a XPASS and a FAIL
for this test-case for cris-elf.  Looking at the generated
code, _foo is indeed no longer saved in a register for CRIS.
While that looks like a regression, coremark results are the
same around this revision, so simply adjust the test-case:
remove the target-specific exceptions for cris-*-*.

	* gcc.dg/tree-ssa/loop-1.c: Remove target-specific test
	and xfail to adjust for recent changes in register allocation.