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/codegen/arm/FP/Thumb2VFP.cc b/src/compiler/codegen/arm/FP/Thumb2VFP.cc
index 60cb476..494e09f 100644
--- a/src/compiler/codegen/arm/FP/Thumb2VFP.cc
+++ b/src/compiler/codegen/arm/FP/Thumb2VFP.cc
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+namespace art {
+
 STATIC bool genArithOpFloat(CompilationUnit* cUnit, MIR* mir,
                             RegLocation rlDest, RegLocation rlSrc1,
                             RegLocation rlSrc2)
@@ -240,3 +242,5 @@
     storeValue(cUnit, rlDest, rlResult);
     return false;
 }
+
+}  // namespace art