structure field annotation strings

R=ken
OCL=18176
CL=18176
diff --git a/src/cmd/gc/go.h b/src/cmd/gc/go.h
index b670be6..a0afb43 100644
--- a/src/cmd/gc/go.h
+++ b/src/cmd/gc/go.h
@@ -147,6 +147,7 @@
 
 	// TFIELD
 	Type*	down;		// also used in TMAP
+	String*	note;			// literal string annotation
 
 	// TARRAY
 	int32	bound;		// negative is dynamic array