XCore target: Lower FRAME_TO_ARGS_OFFSET

[Robert Lytton]

Hi,

Here is an XCore patch to lower FRAME_TO_ARGS_OFFSET:

    XCore target: Lower FRAME_TO_ARGS_OFFSET

    This requires a knowledge of the stack size which is not known until
    the frame is complete, hence the need for the XCoreFTAOElim pass
    which lowers the XCoreISD::FRAME_TO_ARGS_OFFSET instrution into its
    final form.

Robert

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