Reduce namespace pollution.

This leaves us with just the mspace stuff and three libdex functions to clean
up. We deliberately expose the JII API, and I don't think there's anything we
can really do about the art_..._from_code stuff (and at least that starts with
"art_").

Change-Id: I77e58e8330cd2afeb496642302dfe3311e68091a
diff --git a/src/compiler/SSATransformation.cc b/src/compiler/SSATransformation.cc
index 235521d..1f6a3b5 100644
--- a/src/compiler/SSATransformation.cc
+++ b/src/compiler/SSATransformation.cc
@@ -17,6 +17,8 @@
 #include "Dalvik.h"
 #include "Dataflow.h"
 
+namespace art {
+
 /* Enter the node to the dfsOrder list then visit its successors */
 STATIC void recordDFSPreOrder(CompilationUnit* cUnit, BasicBlock* block)
 {
@@ -632,3 +634,5 @@
                                           kReachableNodes,
                                           false /* isIterative */);
 }
+
+}  // namespace art