Hold the LLVMContext by reference rather than by pointer.

llvm-svn: 74640
diff --git a/llvm/lib/Archive/ArchiveWriter.cpp b/llvm/lib/Archive/ArchiveWriter.cpp
index 641e332..e840354 100644
--- a/llvm/lib/Archive/ArchiveWriter.cpp
+++ b/llvm/lib/Archive/ArchiveWriter.cpp
@@ -64,7 +64,7 @@
 }
 
 // Create an empty archive.
-Archive* Archive::CreateEmpty(const sys::Path& FilePath, LLVMContext* C) {
+Archive* Archive::CreateEmpty(const sys::Path& FilePath, const LLVMContext& C) {
   Archive* result = new Archive(FilePath, C);
   return result;
 }