Delete empty files that were intended to be removed long time ago.

llvm-svn: 238171
diff --git a/poolalloc/include/assistDS/DataStructureCallGraph.h b/poolalloc/include/assistDS/DataStructureCallGraph.h
deleted file mode 100644
index e69de29..0000000
--- a/poolalloc/include/assistDS/DataStructureCallGraph.h
+++ /dev/null
diff --git a/poolalloc/lib/AssistDS/DataStructureCallGraph.cpp b/poolalloc/lib/AssistDS/DataStructureCallGraph.cpp
deleted file mode 100644
index e69de29..0000000
--- a/poolalloc/lib/AssistDS/DataStructureCallGraph.cpp
+++ /dev/null