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[cc2] Add endinit() function

This function marks the end of an initializer, and it is
needed because some assembler will need a mark of end
of data.

--- a/cc2/arch/amd64-sysv/code.c

+++ b/cc2/arch/amd64-sysv/code.c

@@ -187,3 +187,8 @@

 writeout(void)

 {

 }

+

+void

+endinit(void)

+{

+}

--- a/cc2/arch/i386-sysv/code.c

+++ b/cc2/arch/i386-sysv/code.c

@@ -186,3 +186,8 @@

 writeout(void)

 {

 }

+

+void

+endinit(void)

+{

+}

--- a/cc2/arch/qbe/code.c

+++ b/cc2/arch/qbe/code.c

@@ -59,3 +59,8 @@

 writeout(void)

 {

 }

+

+void

+endinit(void)

+{

+}

--- a/cc2/arch/z80/code.c

+++ b/cc2/arch/z80/code.c

@@ -183,3 +183,8 @@

 writeout(void)

 {

 }

+

+void

+endinit(void)

+{

+}

--- a/cc2/cc2.h

+++ b/cc2/cc2.h

@@ -164,7 +164,7 @@

 /* code.c */

 extern void data(Node *np);

 extern void defsym(Symbol *sym, int alloc);

-extern void writeout(void);

+extern void writeout(void), endinit(void);

 /* node.c */

 extern void cleannodes(void);

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -441,6 +441,7 @@

 einit(char *token, union tokenop u)

 {

 	ininit = 0;

+	endinit();

 }

 static void