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Do not remove cpp symbols in nested environments

Preprocessor symbols have translation units scope, so it is wrong to
remove when nested environments are poped.

--- a/cc1/symbol.c

+++ b/cc1/symbol.c

@@ -43,7 +43,7 @@

 	for (sym = head; sym && sym->ctx > curctx; sym = next) {

 		next = sym->next;

-		if  (sym->ns == NS_LABEL && curctx != 0) {

+		if  (sym->ns == NS_CPP || sym->ns == NS_LABEL && curctx != 0) {

 			hp->next = sym;

 			hp = sym;

 			continue;