Move Memory.{h,cpp} to Common.

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

llvm-svn: 319221
diff --git a/lld/wasm/SymbolTable.cpp b/lld/wasm/SymbolTable.cpp
index 722d5a0..72f6bdd 100644
--- a/lld/wasm/SymbolTable.cpp
+++ b/lld/wasm/SymbolTable.cpp
@@ -10,9 +10,9 @@
 #include "SymbolTable.h"
 
 #include "Config.h"
-#include "Memory.h"
 #include "Strings.h"
 #include "lld/Common/ErrorHandler.h"
+#include "lld/Common/Memory.h"
 
 #include <unordered_set>