[hwasan][fuchsia] Fix features bitmask checking

[leonardchan]

Summary

Update the address tagging bitmask check to just see if ZX_ARM64_FEATURE_ADDRESS_TAGGING_TBI is enabled rather than checking if it's the only thing that's enabled.

[mcgrathr]

lgtm

compiler-rt/lib/hwasan/hwasan_fuchsia.cpp

195–196

It might be clearer to just say requires ZX_ARM64_FEATURE_ADDRESS_TAGGING_TBI here.

compiler-rt/lib/hwasan/hwasan_fuchsia.cpp

 
 void HwasanInstallAtForkHandler() {}
 
 void InitializeOsSupport() {
 #ifdef __aarch64__
   uint32_t features = 0;
   CHECK_EQ(zx_system_get_features(ZX_FEATURE_KIND_ADDRESS_TAGGING, &features),
            ZX_OK);
-  if (features != ZX_ARM64_FEATURE_ADDRESS_TAGGING_TBI &&
+  if (!(features & ZX_ARM64_FEATURE_ADDRESS_TAGGING_TBI) &&
       flags()->fail_without_syscall_abi) {
     Printf(
-        "FATAL: HWAddressSanitizer requires a kernel with tagged address "
-        "ABI.\n");
+        "FATAL: HWAddressSanitizer requires "
+        "ZX_ARM64_FEATURE_ADDRESS_TAGGING_TBI.\n");
     Die();
   }
 #endif
 }
 
 }  // namespace __hwasan
 
 extern "C" {