[NFC] add comment to keep RegState in sync with doc (#92170)

fmayer · web-flow · commit f83df080a817 · 2024-05-14T13:35:04.000-07:00
diff --git a/llvm/include/llvm/CodeGen/MachineInstrBuilder.h b/llvm/include/llvm/CodeGen/MachineInstrBuilder.h
@@ -40,6 +40,7 @@ class MDNode;
 
 namespace RegState {
 
+// Keep this in sync with the table in MIRLangRef.rst.
 enum {
   /// Register definition.
   Define = 0x2,
