Remove a bunch of Isolate::Current() callsites from simulators

src/mips/simulator-mips.cc

Index: src/mips/simulator-mips.cc
diff --git a/src/mips/simulator-mips.cc b/src/mips/simulator-mips.cc
index e9dd0d32dca5c69b0d8ae19419a580f14a9ec33f..22e4381bea08dcc05c6f60df51081e125398342e 100644
--- a/src/mips/simulator-mips.cc
+++ b/src/mips/simulator-mips.cc
@@ -589,7 +589,7 @@ void MipsDebugger::Debug() {
                  reinterpret_cast<intptr_t>(cur), *cur, *cur);
           HeapObject* obj = reinterpret_cast<HeapObject*>(*cur);
           int value = *cur;
-          Heap* current_heap = v8::internal::Isolate::Current()->heap();
+          Heap* current_heap = sim_->isolate_->heap();
           if (((value & 1) == 0) || current_heap->Contains(obj)) {
             PrintF(" (");
             if ((value & 1) == 0) {
@@ -995,12 +995,12 @@ Simulator::~Simulator() { free(stack_); }
 // offset from the swi instruction so the simulator knows what to call.
 class Redirection {
  public:
-  Redirection(void* external_function, ExternalReference::Type type)
+  Redirection(Isolate* isolate, void* external_function,
+              ExternalReference::Type type)
       : external_function_(external_function),
         swi_instruction_(rtCallRedirInstr),
         type_(type),
         next_(NULL) {
-    Isolate* isolate = Isolate::Current();
     next_ = isolate->simulator_redirection();
     Simulator::current(isolate)->
         FlushICache(isolate->simulator_i_cache(),
@@ -1016,14 +1016,13 @@ class Redirection {
   void* external_function() { return external_function_; }
   ExternalReference::Type type() { return type_; }
 
-  static Redirection* Get(void* external_function,
+  static Redirection* Get(Isolate* isolate, void* external_function,
                           ExternalReference::Type type) {
-    Isolate* isolate = Isolate::Current();
     Redirection* current = isolate->simulator_redirection();
     for (; current != NULL; current = current->next_) {
       if (current->external_function_ == external_function) return current;
     }
-    return new Redirection(external_function, type);
+    return new Redirection(isolate, external_function, type);
   }
 
   static Redirection* FromSwiInstruction(Instruction* swi_instruction) {
@@ -1068,9 +1067,10 @@ void Simulator::TearDown(HashMap* i_cache, Redirection* first) {
 }
 
 
-void* Simulator::RedirectExternalReference(void* external_function,
+void* Simulator::RedirectExternalReference(Isolate* isolate,
+                                           void* external_function,
                                            ExternalReference::Type type) {
-  Redirection* redirection = Redirection::Get(external_function, type);
+  Redirection* redirection = Redirection::Get(isolate, external_function, type);
   return redirection->address_of_swi_instruction();
 }