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Move to symbol() the trick with identifiers num

This patch allows us to have the trick only in one
place and not in all the code.

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -81,7 +81,7 @@

 parameter(char *num)

 {

 	static Symbol *tbl;

-	unsigned i = atoi(num+1);

+	unsigned i = atoi(num);

 	static unsigned nr;

 	if (i >= NR_FUNPARAM)

@@ -97,7 +97,7 @@

 local(char *num)

 {

 	static Symbol *tbl;

-	unsigned i = atoi(num+1);

+	unsigned i = atoi(num);

 	static unsigned nr;

 	if (i >= NR_INT_IDENT)

@@ -113,7 +113,7 @@

 global(char *num)

 {

 	static Symbol *tbl;

-	unsigned i = atoi(num+1);

+	unsigned i = atoi(num);

 	static unsigned nr;

 	if (i >= NR_EXT_IDENT)

@@ -184,7 +184,7 @@

 		[GLOBAL] = global,

 		[PARAMETER] = parameter

 	};

-	return (*tbl[t])(token);

+	return (*tbl[t])(token+1);

 }

 static void