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cc2/qbe: Use correct return type in cast()

We don't have to do anything in qbe when we do cast that decrease
the size of a node, but we do have to update the type of the returned
node.

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

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

@@ -222,8 +222,10 @@

 	s_isint = (ts->flags & INTF) != 0;

 	if (d_isint && s_isint) {

-		if (td->size <= ts->size)

+		if (td->size <= ts->size) {

+			np->type = *td;

 			return np;

+		}

 		assert(td->size == 4 || td->size == 8);

 		switch (ts->size) {

--- /dev/null

+++ b/tests/cc/execute/0204-cast.c

@@ -1,0 +1,17 @@

+int

+main(void)

+{

+	static char *p = "\xe2\x80\x9c";

+	unsigned n = 0;

+

+	for (; *p; p++) {

+		n <<= 1;

+		if ((unsigned char)*p >= ' ' && (unsigned char)*p != 0x7f)

+			n |= 1;

+	}

+

+	if (n != 7)

+		return 1;

+

+	return 0;

+}

--- a/tests/cc/execute/scc-tests.lst

+++ b/tests/cc/execute/scc-tests.lst

@@ -194,3 +194,4 @@

 0201-cpp.c [TODO]

 0202-variadic.c [TODO]

 0203-comment.c

+0204-cast.c