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It is no longer needed now that we assume GC_MARK_STACK ==
GC_MAKE_GCPROS_NOOPS.
* src/bytecode.c (BYTE_MAINTAIN_TOP): Remove.
All uses removed, and code simplified accordingly.
(BEFORE_POTENTIAL_GC, AFTER_POTENTIAL_GC): Remove, since they
are always no-ops now.  All uses removed.
(MAYBE_GC): Remove.  All uses replaced by maybe_gc,
since it is now equivalent.