[libc++] NFC: Normalize `#endif //` comment indentation

GitOrigin-RevId: 4cd6ca102a94e1b64ba3f940cc26b4d7b2b82964
diff --git a/src/thread.cpp b/src/thread.cpp
index 8d49e2f..8dddb24 100644
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -94,7 +94,7 @@
 #       warning hardware_concurrency not yet implemented
 #   endif
     return 0;  // Means not computable [thread.thread.static]
-#endif  // defined(CTL_HW) && defined(HW_NCPU)
+#endif // defined(CTL_HW) && defined(HW_NCPU)
 }
 
 namespace this_thread