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[cc2-qbe] Fix merging of labels

We were copying the id in id and numid fields of the merged label.

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

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

@@ -33,7 +33,7 @@

 			sym = np->u.sym;

 			osym = next->u.sym;

 			osym->id = sym->id;

-			osym->numid = sym->id;

+			osym->numid = sym->numid;

 			osym->u.stmt = sym->u.stmt;

 			return NULL;

 		}