More nitpicking:
1)
Temporary variable "(for limit)" doesn't contain the limit for integer for-loops.
And it might be impossible to determine the proper name at compile-time :-(
What about name
"(for limit/count)" ?
2)
Since there is no subtraction in this instruction anymore, the following comment should be rewritten somehow:
OP_FORPREP,/* A Bx R(A)-=R(A+2); pc+=Bx */
