[PATCH] Implement Named Register Global Variables in LLVM

[Renato Golin]

+ Adding some negative tests
+ Changing docs to reflect on stack register usage only

The latter was preferred to adding more non-allocatable registers, since there aren't many that could be added without further consideration and I don't want to delay this patch longer than it needs to. So, for the time being, only stack registers will be allowed as a named register.

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/named-reg-alloc.ll
  test/CodeGen/AArch64/named-reg-notareg.ll
  test/CodeGen/AArch64/stackpointer.ll
  test/CodeGen/ARM/named-reg-alloc.ll
  test/CodeGen/ARM/named-reg-notareg.ll
  test/CodeGen/ARM/stackpointer.ll
  test/CodeGen/ARM64/named-reg-alloc.ll
  test/CodeGen/ARM64/named-reg-notareg.ll
  test/CodeGen/ARM64/stackpointer.ll
  test/CodeGen/X86/named-reg-alloc.ll
  test/CodeGen/X86/named-reg-notareg.ll
  test/CodeGen/X86/stackpointer.ll
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