[PATCH] Anonymous namespaces are missing import DW_TAG_imported_module.

[Katya Romanova]

Few minor changes:
(1) I added DW_AT_artificial attribute to DW_TAG_imported_module. 
(2) I checked in anonymous-namespace.ll that DW_AT_artificial attribute is generated
(3) I renamed the local variable from Anonymous to Is Anonymous (per Duncan's suggestion).
(4) I fixed copy and paste error in the anonymous-namespace.ll testcase.

Please review.


http://reviews.llvm.org/D7895

Files:
  lib/CodeGen/AsmPrinter/DwarfUnit.cpp
  test/DebugInfo/X86/gnu-public-names.ll
  test/DebugInfo/anonymous-namespace.ll

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