[PATCH, testsuite, committed] Unsupport 20190827-1.c for targets without alias support.

[Iain Sandoe]

This test is failing everywhere on Darwin, which lacks the necessary alias 
support.
I didn’t check to see if there was some way to re-write the test to avoid the 
need for
such support.

tested on powerpc-darwin9, x86_64-darwin16, {x86-64,powerpc64}-linux-gnu,
applied to mainline as obvious,
thanks
Iain

gcc/testsuite/

2019-09-01  Iain Sandoe  <i...@sandoe.co.uk>

        * gcc.c-torture/compile/20190827-1.c: Add dg-requires-alias.

diff --git a/gcc/testsuite/gcc.c-torture/compile/20190827-1.c 
b/gcc/testsuite/gcc.c-torture/compile/20190827-1.c
index f0956179b1..cdf71d8bab 100644
--- a/gcc/testsuite/gcc.c-torture/compile/20190827-1.c
+++ b/gcc/testsuite/gcc.c-torture/compile/20190827-1.c
@@ -1,3 +1,4 @@
+/* { dg-require-alias "" } */
 typedef unsigned char __u8;
 typedef __u8 u8;
 typedef u8 u_int8_t;