[Darwin, PPC, testsuite, committed] Fix pr80125 testcase for Darwin.

[Iain Sandoe]

Darwin (unlike most of the members of the PowerPC port family)
defaults to signed chars, so the test was failing to compile with
a "mismatched parameters" error.

tested on powerpc-darwin9, powerpc-linux-gnu
applied to mainline
thanks
Iain

2019-06-23  Iain Sandoe  <i...@sandoe.co.uk>

        * gcc.target/powerpc/pr80125.c (foo): Use an unsigned char
        vector explicitly for the vec_perm.

diff --git a/gcc/testsuite/gcc.target/powerpc/pr80125.c 
b/gcc/testsuite/gcc.target/powerpc/pr80125.c
index 494a6e6..366602d 100644
--- a/gcc/testsuite/gcc.target/powerpc/pr80125.c
+++ b/gcc/testsuite/gcc.target/powerpc/pr80125.c
@@ -16,7 +16,7 @@ foo ()
   vector int k = vec_mergel (i, j);
   vector int l = vec_sl (k, c);
   vector int m = vec_sl (l, d);
-  vector char o;
+  vector unsigned char o;
   vector int p = vec_perm (m, n, o);
   e = vec_sra (p, c);
   vec_st (e, 0, a);