Refactored the checkOperandsForConflict out of the operands: setter to its senders.
Corrected the spelling of strackFrameValueAtOffset.
Refrain from sending #asAJOperand to AJReserveTemps, test for integer immediates (which never prohibit REX) instead.
The failing stack alignment test now passes.
Removed unused AJReserveTemp instvar operand.
Enhanced AJReserveTemp class comment.
Added AJReserveTemp>>prohibitsRex so it will participate nicely in operand conflict detection.