MIPS: Fix NaN value inconsistency with snapshots (alternate implementation).

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 0726b3d68aea560e6603f98980a61070e42d458f..4f35d3324f712579f9d9f42f37169d593a57856b 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -8394,6 +8394,12 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_CheckIsBootstrapping) {
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_GetRootNan) {
+  RUNTIME_ASSERT(isolate->bootstrapper()->IsActive());
+  return isolate->heap()->nan_value();
+}
+
+
 RUNTIME_FUNCTION(MaybeObject*, Runtime_Call) {
   HandleScope scope(isolate);
   ASSERT(args.length() >= 2);