[PATCH] Refactor debug info lexical block generation

[Amjad Aboud]

Hi echristo, bkramer, dblaikie,

This patch is needed for resolving Bug 19238.
It is the first part which will be followed by D9758.

The idea is to create all debug info lexical block DIEs and add them to the DIScope->DIE map.
Latter, just before emitting the DIEs, we will search the DIE tree and collapse all redundant (useless) DIE lexical blocks.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9960

Files:
  include/llvm/CodeGen/DIE.h
  lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
  lib/CodeGen/AsmPrinter/DwarfDebug.cpp
  lib/CodeGen/AsmPrinter/DwarfDebug.h
  test/DebugInfo/useless_lexical_scope.ll

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