Add bitcode dumping to LlvmCompilationUnit

Change-Id: I6d3492c00d0f0c1c56b64a4b431a3e7b48d7a583
diff --git a/src/compiler/llvm/llvm_compilation_unit.h b/src/compiler/llvm/llvm_compilation_unit.h
index c632046..d96e778 100644
--- a/src/compiler/llvm/llvm_compilation_unit.h
+++ b/src/compiler/llvm/llvm_compilation_unit.h
@@ -123,6 +123,9 @@
 
   void CheckCodeAlign(uint32_t offset) const;
 
+  void DumpBitcodeToFile();
+  void DumpBitcodeToString(std::string& str_buffer);
+
   bool MaterializeToString(std::string& str_buffer);
   bool MaterializeToRawOStream(::llvm::raw_ostream& out_stream);