Move runtime functions to the more logical runtime_entry.cc.

runtime/lib/double.cc

Index: runtime/lib/double.cc
diff --git a/runtime/lib/double.cc b/runtime/lib/double.cc
index 683445c5f6fe0a7496ec8a02f88a3e4754b7f720..813002445b1cb00c566f19e418bc429e9691e81d 100644
--- a/runtime/lib/double.cc
+++ b/runtime/lib/double.cc
@@ -6,13 +6,13 @@
 
 #include "platform/math.h"
 
-#include "vm/code_generator.h"  // DartModulo.
 #include "vm/dart_entry.h"
 #include "vm/double_conversion.h"
 #include "vm/double_internals.h"
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
+#include "vm/runtime_entry.h"  // DartModulo.
 #include "vm/symbols.h"
 
 namespace dart {