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Spiller can now insert spill/reload instrs without having to
worry about the current stack delta. Generation of actual machine
instructions for spills/reloads is deferred until after register
allocation proper.

This is needed in order to write Main_main from pure Cmm.

This order matches the symantic order better since
the GC check is done before the update frame is pushed.

It now matches the order used by the existing codeGen.

See the definition of splitInlineCont for what this is about.
Cures Trac #1627.
Test is simpl017