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[cc1] Add comment in popctx()

The logic of why unlinking symbols is correct is not obvious
from the code, and similar comments were already added for
types and for symbols in cc2.

--- a/cc1/symbol.c

+++ b/cc1/symbol.c

@@ -107,6 +107,11 @@

 	Symbol *next, *sym;

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

+		/*

+		 * Since we are unlinking them in the inverse order

+		 * we do know that tp is always the head of the

+		 * collision list

+		 */

 		next = sym->next;

 		killsym(sym);

 	}