[PATCH], PR target/82015, add PowerPC warning for unpack_vector_int128 with illegal 2nd argument

[Andreas Schwab]

FAIL: gcc.target/powerpc/pr82015.c  (test for errors, line 8)
FAIL: gcc.target/powerpc/pr82015.c  (test for errors, line 13)
FAIL: gcc.target/powerpc/pr82015.c (test for excess errors)
Excess errors:
/daten/gcc/gcc-20170907/gcc/testsuite/gcc.target/powerpc/pr82015.c:6:22: error: unknown type name 'vector'
/daten/gcc/gcc-20170907/gcc/testsuite/gcc.target/powerpc/pr82015.c:11:21: error: unknown type name 'vector'

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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