0.9.18.12: valid/already-dumped confusion in the file compiler/
* A constant is not already dumped just because it is in the valid
* Fopcompiler was validating the wrong object occasionally.
Unfortunately the *DUMP-ONLY-VALID-STRUCTURES* binding still
needed. Couple of FIXME's pertaining to that added.
* Useless WHEN in EMIT-MAKE-LOAD-FORM deleted.
* Record a bug.