XCore target: Fix llvm.eh.return and EH info register handling

[Robert Lytton]

Hi,

Here is a patch for handling the exception unwind on the XCore target.

    XCore target: Fix llvm.eh.return and EH info register handling

    For functions which call callsUnwindInit() and callsEHReturn()
    spill slots for R0 & R1 (exception info regs) are added without spilling R0 & R1.
    The EH unwinder will write the exception info to these spill slots.
    The exception info registers are only restored during an llv.eh.return() to a landing pad.
    Under normal return, R0 holds the function's return code and must not be overwritten.

Robert

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