[PATCH] Implement Named Register Global Variables in LLVM

[Renato Golin]

Re-writing the patch after Tim's comments. Changes are:

* DAG node is now legal and dealt with by SelectionDAGISel
* Each TargetLowering restricts the register names locally
* Generic TargetLowering restricts all (default implementation)
* Using report_fatal_error instead of llvm_unreachable
* ARM64 support and test
* Changed wording in LangRef
* Fixed some typos

The only change not done is the type (from pointer to polymorphic), discussions should continue.

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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