[Isolates] Pass current isolate address to the regexp native functions

src/arm/regexp-macro-assembler-arm.cc

Index: src/arm/regexp-macro-assembler-arm.cc
diff --git a/src/arm/regexp-macro-assembler-arm.cc b/src/arm/regexp-macro-assembler-arm.cc
index c3a77dd95e292df359df8debfda61363d04e2997..f1e25432e5a6d823641715ab2cfa84e2c1f57ea9 100644
--- a/src/arm/regexp-macro-assembler-arm.cc
+++ b/src/arm/regexp-macro-assembler-arm.cc
@@ -60,6 +60,7 @@ namespace internal {
  *
  * Each call to a public method should retain this convention.
  * The stack will have the following structure:
+ *       - Isolate* isolate   (Address of the current isolate)
  *       - direct_call        (if 1, direct call from JavaScript code, if 0 call
  *                             through the runtime system)
  *       - stack_area_base    (High end of the memory area to use as
@@ -992,8 +993,10 @@ static T& frame_entry(Address re_frame, int frame_offset) {
 int RegExpMacroAssemblerARM::CheckStackGuardState(Address* return_address,
                                                   Code* re_code,
                                                   Address re_frame) {
-  if (Isolate::Current()->stack_guard()->IsStackOverflow()) {
-    Isolate::Current()->StackOverflow();
+  Isolate* isolate = frame_entry<Isolate*>(re_frame, kIsolate);
+  ASSERT(isolate == Isolate::Current());
+  if (isolate->stack_guard()->IsStackOverflow()) {
+    isolate->StackOverflow();
     return EXCEPTION;
   }