[PATCH/testsuite] Skip vect-strided-shift-1.c on MIPS with -mpaired-single option.

[Paul Hua]

Hi:

The vect-strided-shift-1.c test fails on MIPS target.

FAIL: gcc.dg/vect/vect-strided-shift-1.c  -mpaired-single
scan-tree-dump-times vect "vectorized 1 loops in function" 1 (found 0
times)
FAIL: gcc.dg/vect/vect-strided-shift-1.c -flto -ffat-lto-objects
-mpaired-single  scan-tree-dump-times vect "vectorized 1 loops in
function" 1 (found 0 times)

Because the MIPS paired single insns only support for float
operations, not suite for this test.
added dg-skip-if directives on it for skip -mpaired-single option.

Ok for commit ?

Paul Hua

ChangeLog entries:

gcc/testsuite/ChangeLog

2018-03-14  Chenghua Xu <paul.hua.gm@gmail.com>

    * gcc.dg/vect/vect-strided-shift-1.c: Add dg-skip-if for
    MIPS with -mpaired-single directives.
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