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[as] Preserve order of the symbols in the output file

It is a bit annoying to have the symbols in inverse
state, and for this reason the link insertion strategy
is changed.

--- a/as/symbol.c

+++ b/as/symbol.c

@@ -41,7 +41,7 @@

 static Symbol *hashtbl[HASHSIZ];

 static Alloc *tmpalloc;

-Symbol *linesym, *symlist;

+Symbol *linesym, *symlist, *symlast;

 #ifndef NDEBUG

 void

@@ -95,9 +95,16 @@

 	sym->value = 0;

 	sym->section = cursec;

 	sym->hash = *list;

-	sym->next = symlist;

+	sym->next = NULL;

-	return symlist = *list = sym;

+	*list = sym;

+	if (symlast)

+		symlast->next = sym;

+	symlast = sym;

+	if (!symlist)

+		symlist = sym;

+

+	return sym;

 }

 Symbol *