[Bitcode] Remove unused declaration writeGlobalVariableMetadataAttachment (NFC)

The declaration was introduced without a corresponding definition on
May 31, 2016 in commit cceae7feda8e33194d1a6c5963bd4114bb8d2b36.

diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index f7c186f..ed2c66e 100644 (file)
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -373,7 +373,6 @@ private:
   void writeModuleMetadata();
   void writeFunctionMetadata(const Function &F);
   void writeFunctionMetadataAttachment(const Function &F);
-  void writeGlobalVariableMetadataAttachment(const GlobalVariable &GV);
   void pushGlobalMetadataAttachment(SmallVectorImpl<uint64_t> &Record,
                                     const GlobalObject &GO);
   void writeModuleMetadataKinds();