Revert "[flang] Recognize compiler directives after expansion in comm… (#180982)
…ent (#180062)"
This reverts commit 0d64801bc3b99a73d20032f74df3b87e0a7ed04e.
Lines like "!MACRO ... &" in which MACRO expands to a compiler directive
are now failing because they are not being recognized as having line
continuations. Will fix and try again.