[flang] Add -fdebug-dump-parse-tree and -fdebug-resolve-names

[flang] Add -fdebug-dump-parse-tree and -fdebug-resolve-names

"f18 -fdebug-resolve-names -fparse-only ..." is equivalent to what
test-type used to do, so the test-type executable can be eliminated.

-fdebug-dump-parse-tree does the parse-tree dumping that test-sema
does, but test-sema does more so I have left it alone.

Original-commit: flang-compiler/f18@8b3816528e6463acd18bbf6ed29c40869b15ea3a
Reviewed-on: https://github.com/flang-compiler/f18/pull/55