XCore target: addMemOperand as necessary

[Robert Lytton]

Hi,

    XCore target: addMemOperand as necessary

    BuildMI instructions were not including MachineMemOperand information.
    This was discovered by 'MultiSource/Benchmarks/Prolangs-C/cdecl' failing
    due to a FrameIndex load incorrectly being hoisted by postra-machine-licm.
    No other tests have been found to fail.

I have attempted to write a test to highlight this bug unsuccessfully.
The original test-suite 'MultiSource/Benchmarks/Prolangs-C/cdecl' was the only test that failed and now passes.

As part of the trampoline, the reloading of R11 from a pre-stack location in emitPrologue() is missing the addMemOperand().

Robert

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