[PATCH] Rename EH related stuff to be more precise

[Reid Kleckner]

Hi echristo,

The current "WinEH" exception handling type is more about Itanium-style
LSDA tables layered on top of the Windows native unwind info format
instead of .eh_frame tables or EHABI unwind info. Use the name
"ItaniumWinEH" to better reflect the hybrid nature of the design.

Also rename isExceptionHandlingDWARF to usesItaniumLSDAForExceptions,
since the LSDA is part of the Itanium C++ ABI document, and not the
DWARF standard.

http://reviews.llvm.org/D6279

Files:
  include/llvm/MC/MCAsmInfo.h
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
  lib/CodeGen/AsmPrinter/EHStreamer.cpp
  lib/CodeGen/Passes.cpp
  lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp
  lib/Target/X86/X86FrameLowering.cpp
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