FIX #1466 (partly), which was causing concprog001(ghci) to fail
An AP_STACK now ensures that there is at least AP_STACK_SPLIM words of stack headroom available after unpacking the payload. Continuations that require more than AP_STACK_SPLIM words of stack must do their own stack checks instead of aggregating their stack usage into the parent frame. I have made this change for the interpreter, but not for compiled code yet - we should do this in the glorious rewrite of the code generator.
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