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[cc1] Do not create id for cpp symbols

CPP symbols are not going to be emitted ever, so it is
stupid to create identifiers for them.

--- a/cc1/symbol.c

+++ b/cc1/symbol.c

@@ -127,6 +127,8 @@

 {

 	unsigned short id;

+	if (lexmode == CPPMODE)

+		return 0;

 	id = ++counterid;

 	if (id == 0) {

 		die("Overflow in %s identifiers",

@@ -219,11 +221,9 @@

 {

 	Symbol *sym = newsym(NS_IDEN);

-	if (lexmode != CPPMODE) {

+	if (lexmode != CPPMODE)

 		sym->type = mktype(chartype, ARY, len, NULL);

-		sym->id = newid();

-	}

-

+	sym->id = newid();

 	sym->flags |= SSTRING | SCONSTANT | SPRIVATE;

 	sym->u.s = xmalloc(len);

 	if (s)