Rename FlagBits enums using MixKhronosData instead of through INameTrimmer

This also prepares the Rewriter class for a few other changes.

Author: Exanite

.silktouch/ce8a69a66cd3bd3f.stout

@@ -21,5 +21,5 @@ public enum AcquireProfilingLockFlagsKHR : uint
             "VK_KHR_performance_query+VK_VERSION_1_1",
         ]
     )]
-    MaxEnumKHR = 0x7FFFFFFF,
+    FlagBitsMaxEnumKHR = 0x7FFFFFFF,
 }