CFI: Run the tests only on supported architectures/OSs.

Specifically, only run the cfi-icall tests on x86/x86_64, and add
an XFAIL for darwin.

llvm-svn: 247325

compiler-rt/test/cfi/icall/external-call.c

@@ -2,6 +2,10 @@
 // RUN: %t1 c 1 2>&1 | FileCheck --check-prefix=CFI %s
 // RUN: %t1 s 2 2>&1 | FileCheck --check-prefix=CFI %s
 
+// This test uses jump tables containing PC-relative references to external
+// symbols, which the Mach-O object writer does not currently support.
+// XFAIL: darwin
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <math.h>

compiler-rt/test/cfi/icall/lit.local.cfg

@@ -0,0 +1,3 @@
+# The cfi-icall checker is only supported on x86 and x86_64 for now.
+if config.root.host_arch not in ['x86', 'x86_64']:
+  config.unsupported = True