[Bug testsuite/127030] rs6000: vec-permute-ext-runnable.c fails on power10

[jeevitha at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127030

--- Comment #1 from Jeevitha <jeevitha at gcc dot gnu.org> ---
rs6000 Power10 big-endian (BE) tests currently fail because the expected
results assume little-endian behavior.

FAIL: gcc.target/powerpc/vec-permute-ext-runnable.c execution test

ERROR, vec_permx (vsrc_a_d, vsrc_b_d, vsrc_c_uchar)
 vresult_d[0] = 1.000000, expected_vresult_d[0] = 1.000000
 vresult_d[1] = 0.000000, expected_vresult_d[1] = -4.000000