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[VSX] Drop the clang-4 workaround for vec_xxpermdi

clang-6 seems to support it out of box.

E.g. VP9SubtractBlockTest.DISABLED_Speed with the workaround:
[    BENCH ]      4x4  286.5 ms ( ±0.2 ms )
Without:
[    BENCH ]      4x4  215.2 ms ( ±0.9 ms )

Change-Id: I28b3a2cc93c0d72f52f5a48cc06d8ed4ef26913f

--- a/vpx_dsp/ppc/types_vsx.h

+++ b/vpx_dsp/ppc/types_vsx.h

@@ -23,7 +23,7 @@

 typedef vector bool short bool16x8_t;

 typedef vector bool int bool32x4_t;

-#ifdef __clang__

+#if defined(__clang__) && __clang_major__ < 6

 static const uint8x16_t xxpermdi0_perm = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05,

                                            0x06, 0x07, 0x10, 0x11, 0x12, 0x13,

                                            0x14, 0x15, 0x16, 0x17 };