[PATCH] Generalize debug info / EH emission in AsmPrinter

[Timur Iskhodzhanov]

  The change got reverted, due to beginFunction() not called by one of the subclasses of AsmPrinter.

  lib/Target/R600/AMDGPUAsmPrinter.cpp
    55 /// We need to override this function so we can avoid
    56 /// the call to EmitFunctionHeader(), which the MCPureStreamer can't handle.
    57 bool AMDGPUAsmPrinter::runOnMachineFunction(MachineFunction &MF) {

  Attached is a patch that addresses that.

Hi echristo, rafael, dblaikie,

http://llvm-reviews.chandlerc.com/D2222

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2222?vs=5781&id=5880#toc

Files:
  include/llvm/CodeGen/AsmPrinter.h
  lib/CodeGen/AsmPrinter/ARMException.cpp
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/CodeGen/AsmPrinter/AsmPrinterHandler.h
  lib/CodeGen/AsmPrinter/DIE.cpp
  lib/CodeGen/AsmPrinter/DwarfCFIException.cpp
  lib/CodeGen/AsmPrinter/DwarfDebug.cpp
  lib/CodeGen/AsmPrinter/DwarfDebug.h
  lib/CodeGen/AsmPrinter/DwarfException.cpp
  lib/CodeGen/AsmPrinter/DwarfException.h
  lib/CodeGen/AsmPrinter/Win64Exception.cpp
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