gcc.dg/pr84877.c: Xfail for cris-*-*

gcc.dg/pr84877.c: Xfail for cris-*-*

Unfortunately it appears that this PR is on nobody's radar.
Xfailing it to get an arguably artificial zero regression
state (since T0=2007-01-05) helps my autotester.

Caveat: the pass/fail state of this test, as long as stack
alignment isn't adjusted, is dependent on the alignment of
the stack at the entry of main, so depending on the target,
e.g. the size and number of environment variables at
invocation time can affect the result (including simulator
runs where environment variables are propagated to the
target).

gcc/testsuite:
	PR middle-end/84877
	* gcc.dg/pr84877.c: Xfail for cris-*-*.