Add regression test for #1628.

Looks like this was already fixed by #1615.

Close #1628.

Author: munificent

test/tall/regression/1600/1628.unit

@@ -0,0 +1,10 @@
+>>>
+bool f(bool b, int i) {
+  return // Check b.
+  b == true || i.isEven;
+}
+<<<
+bool f(bool b, int i) {
+  return // Check b.
+  b == true || i.isEven;
+}