Address comments

Author: arsenm

llvm/include/llvm/TargetParser/Triple.h

@@ -594,8 +594,8 @@ class Triple {
     return (getVendor() == Triple::Apple) && isOSBinFormatMachO();
   }
 
-  /// Is this a "Darwin" OS (macOS, iOS, tvOS, watchOS, XROS, bridgeOS, or
-  /// DriverKit).
+  /// Is this a "Darwin" OS (macOS, iOS, tvOS, watchOS, DriverKit, XROS, or
+  /// bridgeOS).
   bool isOSDarwin() const {
     return isMacOSX() || isiOS() || isWatchOS() || isDriverKit() || isXROS() ||
            isBridgeOS();

llvm/lib/MC/MCStreamer.cpp

@@ -1453,13 +1453,9 @@ static VersionTuple getMachoBuildVersionSupportedOS(const Triple &Target) {
   case Triple::WatchOS:
     return VersionTuple(5);
   case Triple::DriverKit:
-    // DriverKit always uses the build version load command.
-    return VersionTuple();
-  case Triple::XROS:
-    // XROS always uses the build version load command.
-    return VersionTuple();
   case Triple::BridgeOS:
-    // Who knows?
+  case Triple::XROS:
+    // DriverKit/BridgeOS/XROS always use the build version load command.
     return VersionTuple();
   default:
     break;