Move global V8::IsDead() into the Isolate.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index bcccae498411394604611ccc8879ea3c4b319c53..4157c72bdca81653df831cdd54b930dbd48bd436 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1792,6 +1792,7 @@ Isolate::Isolate()
       regexp_stack_(NULL),
       date_cache_(NULL),
       code_stub_interface_descriptors_(NULL),
+      has_fatal_error_(false),
       use_crankshaft_(true),
       initialized_from_snapshot_(false),
       cpu_profiler_(NULL),
@@ -2148,6 +2149,8 @@ bool Isolate::Init(Deserializer* des) {
 
   stress_deopt_count_ = FLAG_deopt_every_n_times;
 
+  has_fatal_error_ = false;
+
   use_crankshaft_ = FLAG_crankshaft
       && !Serializer::enabled()
       && CPU::SupportsCrankshaft();