[compiler-rt] [safestack] Silent overflow.c test on aarch64

The safestack overflow.c test is currently failing on an aarch64
buildbot with a segfault, but it is currently passing on other
configuration.

This patch silent the issue for now on aarch64 by setting to all
supported architectures the 'stable-runtime' configure and set
the test to requires it.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@255491 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/safestack/overflow.c b/test/safestack/overflow.c
index 14e2982..2743694 100644
--- a/test/safestack/overflow.c
+++ b/test/safestack/overflow.c
@@ -7,6 +7,8 @@
 // Test that buffer overflows on the unsafe stack do not affect variables on the
 // safe stack.
 
+// REQUIRES: stable-runtime
+
 __attribute__((noinline))
 void fct(volatile int *buffer)
 {