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

src/x64/simulator-x64.h

Index: src/x64/simulator-x64.h
diff --git a/src/x64/simulator-x64.h b/src/x64/simulator-x64.h
index 99649ec018a0b2f7c88cc7be45fc49033c15612e..f1351c88cfe3b9d96d0c7134dc807cf3a2e8c5dc 100644
--- a/src/x64/simulator-x64.h
+++ b/src/x64/simulator-x64.h
@@ -13,7 +13,7 @@ namespace internal {
 // Since there is no simulator for the x64 architecture the only thing we can
 // do is to call the entry directly.
 // TODO(X64): Don't pass p0, since it isn't used?
-#define CALL_GENERATED_CODE(entry, p0, p1, p2, p3, p4) \
+#define CALL_GENERATED_CODE(isolate, entry, p0, p1, p2, p3, p4) \
   (entry(p0, p1, p2, p3, p4))
 
 typedef int (*regexp_matcher)(String*, int, const byte*,
@@ -21,7 +21,8 @@ typedef int (*regexp_matcher)(String*, int, const byte*,
 
 // Call the generated regexp code directly. The code at the entry address should
 // expect eight int/pointer sized arguments and return an int.
-#define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6, p7, p8) \
+#define CALL_GENERATED_REGEXP_CODE(isolate, entry, p0, p1, p2, p3, p4, p5, p6, \
+                                   p7, p8)                                     \
   (FUNCTION_CAST<regexp_matcher>(entry)(p0, p1, p2, p3, p4, p5, p6, p7, p8))
 
 // The stack limit beyond which we will throw stack overflow errors in
@@ -34,11 +35,13 @@ class SimulatorStack : public v8::internal::AllStatic {
     return c_limit;
   }
 
-  static inline uintptr_t RegisterCTryCatch(uintptr_t try_catch_address) {
+  static inline uintptr_t RegisterCTryCatch(Isolate* isolate,
+                                            uintptr_t try_catch_address) {
+    USE(isolate);
     return try_catch_address;
   }
 
-  static inline void UnregisterCTryCatch() { }
+  static inline void UnregisterCTryCatch(Isolate* isolate) { USE(isolate); }
 };
 
 }  // namespace internal