Properly close mapped files.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19863 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bytecode/Archive/Archive.cpp b/lib/Bytecode/Archive/Archive.cpp
index 2d79bd6..aa2db41 100644
--- a/lib/Bytecode/Archive/Archive.cpp
+++ b/lib/Bytecode/Archive/Archive.cpp
@@ -143,7 +143,7 @@
 Archive::~Archive() {
   // Shutdown the file mapping
   if (mapfile) {
-    mapfile->unmap();
+    mapfile->close();
     delete mapfile;
   }
   // Delete any ModuleProviders and ArchiveMember's we've allocated as a result