XCore: vararg fix

[Robert Lytton]

Hi Richard,

Here are two patches for fixing vararg handling in the xcore backend.

'PatchRenameFile' renames:
    test/CodeGen/XCore/2011-08-01-VarargsBug.ll
    test/CodeGen/XCore/varargs.ll

'PatchVarArgs' is the fix and added test

Robet

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