testsuite: Skip gcc.dg/ipa/pr77653.c for CRIS

CRIS defines DATA_ALIGNMENT such that alignment can be
applied differently to different data of the same type, when
"references to it must bind to the current definition"
(varasm.cc:align_variable).  Here, it means that more
alignment is then applied to g, but not f, so the test-case
fails because another message is emitted than the expected:
a same-alignment test dominates the not-discardable test,
and we get "Not unifying; original and alias have
incompatible alignments" rather than "Not unifying; alias
cannot be created; target is discardable".  Because this
DATA_ALIGNMENT behavior for CRIS depends on target options,
and this test is already artificial by the use of -fcommon,
better skip it.

	* gcc.dg/ipa/pr77653.c: Skip for cris-*-*.

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