Add regression test for cvt nodes in ?: expression

regress/usr.bin/xlint/lint1/test16.c

@@ -0,0 +1,13 @@
+/* CVT node handling in ?: operator */
+typedef unsigned long int size_t;
+struct filecore_direntry {
+	unsigned len:32;
+};
+int
+main(void)
+{
+	struct filecore_direntry dirent = { 0 };
+	size_t  uio_resid = 0;
+	size_t bytelen = (((dirent.len)<(uio_resid))?(dirent.len):(uio_resid));
+	return bytelen;
+}