|:: Int||stack offset in words, positive or negative
|Get an AddrMode relative to the address in sp.
This gives us a stack relative addressing mode for volatile
temporaries and for excess call arguments.
|Get an address relative to the frame pointer.
This doesn't work work for offsets greater than 13 bits; we just hope for the best
|Convert a spill slot number to a *byte* offset, with no sign.
The maximum number of spill slots available on the C stack.
If we use up all of the slots, then we're screwed.
Why do we reserve 64 bytes, instead of using the whole thing??
-- BL 20090215
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