Add missing standard headers. Patch by Joerg Sonnenberger!

llvm-svn: 122193
diff --git a/llvm/lib/Support/MemoryBuffer.cpp b/llvm/lib/Support/MemoryBuffer.cpp
index d3c71b9..b7d70dd 100644
--- a/llvm/lib/Support/MemoryBuffer.cpp
+++ b/llvm/lib/Support/MemoryBuffer.cpp
@@ -24,6 +24,7 @@
 #include <cstdio>
 #include <cstring>
 #include <cerrno>
+#include <new>
 #include <sys/types.h>
 #include <sys/stat.h>
 #if !defined(_MSC_VER) && !defined(__MINGW32__)