Move atomic_support.h and config_elast.h into src/include

llvm-svn: 245354
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: e8fd1645695e6920537731ae70b0ffb894df514c
diff --git a/src/memory.cpp b/src/memory.cpp
index 66fb143..369f97f 100644
--- a/src/memory.cpp
+++ b/src/memory.cpp
@@ -13,7 +13,7 @@
 #include "mutex"
 #include "thread"
 #endif
-#include "support/atomic_support.h"
+#include "include/atomic_support.h"
 
 _LIBCPP_BEGIN_NAMESPACE_STD