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cc2/qbe: Update qbe to follow upstream

Lot of changes happened since the scc patches for qbe
were written. The patches were rebased and sent to
upstream repository, but it will take some time until
these patches are integrated there. Meanwhile we update
our fork and wait to the update of upstream.

git/query: bad hash b0e3ca697787cd405535278dc32148767002619e

--- a/src/cmd/cc/cc2/target/qbe/code.c

+++ b/src/cmd/cc/cc2/target/qbe/code.c

@@ -295,10 +295,11 @@

 		return;

 	if (sym->kind == SGLOB)

 		fputs("export ", stdout);

+	if ((tp->flags & INITF) == 0)

+		fputs("common ", stdout);

-	printf("data %s = %s align %d {\n",

+	printf("data %s = align %d {\n",

 	       symname(sym),

-	       (tp->flags & INITF) ? "" : "common",

 	       tp->align);

 	if ((tp->flags & INITF) == 0)

 		printf("\tz\t%lu\n}\n", tp->size);