[PATCH] [XCore] Support functions returning more than 4 words.

[Richard Osborne]

Hi robertlytton,

If a function returns a large struct by value return the first 4 words
in registers and the rest on the stack in a location reserved by the
caller. This is needed to support the xC language which supports
functions returning an arbitrary number of return values.

http://llvm-reviews.chandlerc.com/D2889

Files:
  lib/Target/XCore/XCoreCallingConv.td
  lib/Target/XCore/XCoreISelLowering.cpp
  lib/Target/XCore/XCoreISelLowering.h
  lib/Target/XCore/XCoreInstrInfo.td
  lib/Target/XCore/XCoreMachineFunctionInfo.h
  test/CodeGen/XCore/bigstructret.ll
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