[asan] Mark atos-symbolizer-dyld-root-path.cc testcase as unsupported on iOS.
// Due to a bug in atos, this only works on x86_64.
// REQUIRES: asan-64-bits
+// Path returned by `which atos` is invalid on iOS.
+// UNSUPPORTED: ios
+
#include <stdlib.h>
#include <string.h>
int main(int argc, char **argv) {
