MIPS: Fixed mistake in condition for Nan fixups from snapshot.

The commit r11871 caused quiet NaN related errors to
appear on Loongson and Sigma platforms when snapshot
is used. This commit fixes those issues.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/10735080
Patch from Akos Palfi <palfia@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12073 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/isolate.cc

@@ -1883,7 +1883,7 @@ bool Isolate::Init(Deserializer* des) {
   heap_.SetStackLimits();
 
   // Quiet the heap NaN if needed on target platform.
-  if (create_heap_objects) Assembler::QuietNaN(heap_.nan_value());
+  if (!create_heap_objects) Assembler::QuietNaN(heap_.nan_value());
 
   deoptimizer_data_ = new DeoptimizerData;
   runtime_profiler_ = new RuntimeProfiler(this);