[PATCH] DW_TAG_typedef and DW_TAG_structure_type not emitted when typedef is used

[jyoti allur]

Hi Eric,
I have implemented the review comments.This issue is specific to explicit cast. 
Debug info of type being explicitly casted to was not emitted. I have added an elaborate testcase to capture the issue which should be resolved with this patch. Could you please review this for me and let me know.

http://reviews.llvm.org/D2498

Files:
  llvm/tools/clang/lib/CodeGen/CGDebugInfo.cpp
  llvm/tools/clang/lib/CodeGen/CGDebugInfo.h
  llvm/tools/clang/lib/CodeGen/CGExprScalar.cpp
  llvm/tools/clang/test/CodeGen/Debug-info-explicitcast.c
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