[hwasan] Disable test with hwasan-aliasing

It's likely flaky because we tag the stack, which
is unsupported in this mode.

Author: vitalybuka

compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.c

@@ -21,6 +21,9 @@
 //     thread.
 //  2. Stack poisoned by `inparent` is not poisoned in `inchild` thread.
 
+// Stack tagging is unsupported.
+// UNSUPPORTED: hwasan-aliasing
+
 #include <assert.h>
 #include <pthread.h>
 #include <stdint.h>