plan9 line numbers and line table

SVN=122793
diff --git a/src/cmd/6g/gg.h b/src/cmd/6g/gg.h
index c2cfc44..195788b 100644
--- a/src/cmd/6g/gg.h
+++ b/src/cmd/6g/gg.h
@@ -97,6 +97,8 @@
 EXTERN	long	pcloc;		// instruction counter
 EXTERN	String	emptystring;
 extern	char*	anames[];
+EXTERN	Hist*	hist;
+EXTERN	Prog	zprog;
 
 /*
  * gen.c
@@ -195,6 +197,7 @@
 void	ieeedtod(Ieee*, double);
 void	dumpstrings(void);
 void	dumpsignatures(void);
+void	outhist(Biobuf*);
 
 /*
  * align