Move Memory.{h,cpp} to Common.

Differential Revision: https://reviews.llvm.org/D40571

llvm-svn: 319221
diff --git a/lld/wasm/Writer.cpp b/lld/wasm/Writer.cpp
index a97d688..301326b 100644
--- a/lld/wasm/Writer.cpp
+++ b/lld/wasm/Writer.cpp
@@ -10,12 +10,12 @@
 #include "Writer.h"
 
 #include "Config.h"
-#include "Memory.h"
 #include "OutputSections.h"
 #include "OutputSegment.h"
 #include "SymbolTable.h"
 #include "WriterUtils.h"
 #include "lld/Common/ErrorHandler.h"
+#include "lld/Common/Memory.h"
 #include "lld/Common/Threads.h"
 #include "llvm/Support/FileOutputBuffer.h"
 #include "llvm/Support/Format.h"