[PATCH] Implement inalloca codegen for x86 with the new inalloca design

[Reid Kleckner]

    - add more comments and docs
    - revert frame lowering changes
    - rebased

Hi echristo,

http://llvm-reviews.chandlerc.com/D2637

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2637?vs=6753&id=6803#toc

Files:
  docs/LangRef.rst
  include/llvm/Support/CallSite.h
  include/llvm/Target/TargetCallingConv.h
  include/llvm/Target/TargetLowering.h
  lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/TargetLowering.cpp
  lib/IR/Mangler.cpp
  lib/Target/X86/X86FastISel.cpp
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/inalloca-ctor.ll
  test/CodeGen/X86/inalloca-invoke.ll
  test/CodeGen/X86/inalloca-stdcall.ll
  test/CodeGen/X86/inalloca.ll
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