middle-end: force AMDGCN test for vect-early-break_18.c to consistent architecture [PR119286]

The given test is intended to test vectorization of a strided access done by
having a step of > 1.

GCN target doesn't support load lanes, so the testcase is expected to fail,
other targets create a permuted load here which we then then reject.

However some GCN arch don't seem to support the permuted loads either, so the
vectorizer tries a gather/scatter.  But the indices aren't supported by some
target, so instead the vectorizer scalarizes the loads.

I can't really test for which architecture is being used by the compiler, so
instead this updates the testcase to use one single architecture so we get a
consistent result.

gcc/testsuite/ChangeLog:

	PR target/119286
	* gcc.dg/vect/vect-early-break_18.c: Force -march=gfx908 for amdgcn.

0 files changed, 0 insertions, 0 deletions