[Darwin][ASan] Fix "interceptor working?" check for DriverKit platform

[thetruestblue]

Summary

The previous check for interceptors used 'pthread_create' which is not available on DriverKit.
Needed a new interceptor wrapped symbol that satisfies the following constraints:

• Symbol is available in DriverKit
• Symbol is provided by simulator runtime dylibs (dlsym() fails to look up host-provided symbols)

puts() satisfies all of the above constraints.

rdar://87895539

[yln]

Suggested title for commit: [Darwin][ASan] Fix "interceptor working?" check for DriverKit platform

Please explain in the commit message why we picked puts(). We want to point out our constraints:

• Available on DriverKit (pthread_create() isn't)
• In the simulators, dlsym()fails to lookup host-provided symbols (symbols not provided by the simulator runtime dylibs)

[yln]

Blue doesn't have commit access yet. I will land her change.

compiler-rt/lib/sanitizer_common/sanitizer_mac.cpp

Report("ERROR: The process is launched without DYLD_INSERT_LIBRARIES, "
            "which is required for the sanitizer to work. We tried to set the "
            "environment variable and re-execute itself, but execv() failed, "
            "possibly because of sandbox restrictions. Make sure to launch the "
            "executable with:\n%s=%s\n", kDyldInsertLibraries, new_env);
     RAW_CHECK("execv failed" && 0);
   }
 
   // Verify that interceptors really work.  We'll use dlsym to locate
-  // "pthread_create", if interceptors are working, it should really point to
-  // "wrap_pthread_create" within our own dylib.
-  Dl_info info_pthread_create;
-  void *dlopen_addr = dlsym(RTLD_DEFAULT, "pthread_create");
-  RAW_CHECK(dladdr(dlopen_addr, &info_pthread_create));
-  if (internal_strcmp(info.dli_fname, info_pthread_create.dli_fname) != 0) {
+  // "puts", if interceptors are working, it should really point to
+  // "wrap_puts" within our own dylib.
+  Dl_info info_puts;
+  void *dlopen_addr = dlsym(RTLD_DEFAULT, "puts");
+  RAW_CHECK(dladdr(dlopen_addr, &info_puts));
+  if (internal_strcmp(info.dli_fname, info_puts.dli_fname) != 0) {
     Report(
         "ERROR: Interceptors are not working. This may be because %s is "
         "loaded too late (e.g. via dlopen). Please launch the executable "
         "with:\n%s=%s\n",
         SanitizerToolName, kDyldInsertLibraries, info.dli_fname);
     RAW_CHECK("interceptors not installed" && 0);
   }