[PATCH] Implement Named Register Global Variables in LLVM

[Renato Golin]

Changes:

* Merging docs to make it easier to not get them outdated
* Removed the "stack" register name for now

Not changed:

* It still doesn't check for allocatable vs. non-allocatable, but it has a list of registers it supports and emit an error if the required register is not on the list. This is not the best solution but it's a placeholder for a better implementation, which should be on another patch.

For better error reporting, the front-end could do some checking. The errors from the back-end are quite ugly and I'd rather it not be the first line of defence in any case.

http://reviews.llvm.org/D3261

Files:
  docs/LangRef.rst
  include/llvm/CodeGen/ISDOpcodes.h
  include/llvm/CodeGen/SelectionDAGISel.h
  include/llvm/IR/Intrinsics.td
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGDumper.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
  lib/Target/AArch64/AArch64ISelLowering.cpp
  lib/Target/AArch64/AArch64ISelLowering.h
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMISelLowering.h
  lib/Target/ARM64/ARM64ISelLowering.cpp
  lib/Target/ARM64/ARM64ISelLowering.h
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  test/CodeGen/AArch64/stackpointer.ll
  test/CodeGen/ARM/stackpointer.ll
  test/CodeGen/ARM64/stackpointer.ll
  test/CodeGen/X86/stackpointer.ll
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