[PATCH] Emit correct linkage-name attribute based on DWARF version.

[Paul Robinson]

Hi echristo, dblaikie, aprantl,

There are still 4 tests that check for DW_AT_MIPS_linkage_name,
because they specify DWARF 2 or 3 in the module metadata. So, I didn't
create an explicit version-based test for this.

http://reviews.llvm.org/D8227

Files:
  lib/CodeGen/AsmPrinter/DwarfUnit.cpp
  test/DebugInfo/2010-04-06-NestedFnDbgInfo.ll
  test/DebugInfo/PR20038.ll
  test/DebugInfo/X86/DW_AT_specification.ll
  test/DebugInfo/X86/arguments.ll
  test/DebugInfo/X86/concrete_out_of_line.ll
  test/DebugInfo/X86/debug-info-static-member.ll
  test/DebugInfo/X86/debug-loc-offset.ll
  test/DebugInfo/X86/gnu-public-names.ll
  test/DebugInfo/X86/linkage-name.ll
  test/DebugInfo/X86/pr11300.ll
  test/DebugInfo/namespace_function_definition.ll
  test/DebugInfo/namespace_inline_function_definition.ll
  test/Linker/type-unique-odr-a.ll

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