NFC, make XFAIL work on macOS correctly for test/Driver/XRay/xray-instrument-os.c

The test 'test/Driver/XRay/xray-instrument-os.c' is supposed to XFAIL on -darwin triples.
However, LLVM can be configured to be built with a -macos triple instead, which is equivalent
to -darwin. This commit updates the XFAIL condition to also XFAIL with a -macos host triple.

llvm-svn: 360374

clang/test/Driver/XRay/xray-instrument-os.c

@@ -1,4 +1,4 @@
 // RUN: not %clang -o /dev/null -v -fxray-instrument -c %s
-// XFAIL: -linux-, -freebsd, -darwin
+// XFAIL: -linux-, -freebsd, -darwin, -macos
 // REQUIRES-ANY: amd64, x86_64, x86_64h, arm, aarch64, arm64
 typedef int a;