[PATCH] Remove dead code from DIBuilder

[Jyoti Allur]

DIBuilder: Delete dead code, NFC

Remove both versions of `DIBuilder::createGlobalVariable()` as they are not used. Renaming 'DIBuilder::createStaticVariable()' to 'DIBuilder::createGlobalVariable()' .

http://reviews.llvm.org/D5504

Files:
  llvm/include/llvm/IR/DIBuilder.h
  llvm/lib/IR/DIBuilder.cpp
  llvm/tools/clang/lib/CodeGen/CGDebugInfo.cpp
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