diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
index 1d6480c..c835976 100644
--- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -317,6 +317,8 @@
   void writeDILexicalBlockFile(const DILexicalBlockFile *N,
                                SmallVectorImpl<uint64_t> &Record,
                                unsigned Abbrev);
+  void writeDICommonBlock(const DICommonBlock *N,
+                          SmallVectorImpl<uint64_t> &Record, unsigned Abbrev);
   void writeDINamespace(const DINamespace *N, SmallVectorImpl<uint64_t> &Record,
                         unsigned Abbrev);
   void writeDIMacro(const DIMacro *N, SmallVectorImpl<uint64_t> &Record,
@@ -1686,6 +1688,20 @@
   Record.clear();
 }
 
+void ModuleBitcodeWriter::writeDICommonBlock(const DICommonBlock *N,
+                                             SmallVectorImpl<uint64_t> &Record,
+                                             unsigned Abbrev) {
+  Record.push_back(N->isDistinct());
+  Record.push_back(VE.getMetadataOrNullID(N->getScope()));
+  Record.push_back(VE.getMetadataOrNullID(N->getDecl()));
+  Record.push_back(VE.getMetadataOrNullID(N->getRawName()));
+  Record.push_back(VE.getMetadataOrNullID(N->getFile()));
+  Record.push_back(N->getLineNo());
+
+  Stream.EmitRecord(bitc::METADATA_COMMON_BLOCK, Record, Abbrev);
+  Record.clear();
+}
+
 void ModuleBitcodeWriter::writeDINamespace(const DINamespace *N,
                                            SmallVectorImpl<uint64_t> &Record,
                                            unsigned Abbrev) {