[flang] Add semantics checking for END xxx statements.

Add a negative test for END xxx names.
Reverse the sequence of calls such that resolve-label is before
resolve-name.

Original-commit: flang-compiler/f18@5fe62f108ce83315d2ffde23429188b995850414
Reviewed-on: https://github.com/flang-compiler/f18/pull/184
Tree-same-pre-rewrite: false