MIPS64: Fix exception return from regexp CheckStackGuardState().

src/mips64/regexp-macro-assembler-mips64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS64
 
 #include "src/code-stubs.h"
 #include "src/log.h"
@@ skipping 1128 matching lines @@
 }
 
 
 // Helper function for reading a value out of a stack frame.
 template <typename T>
 static T& frame_entry(Address re_frame, int frame_offset) {
   return reinterpret_cast<T&>(Memory::int32_at(re_frame + frame_offset));
 }
 
 
-int RegExpMacroAssemblerMIPS::CheckStackGuardState(Address* return_address,
-                                                   Code* re_code,
-                                                   Address re_frame) {
+int64_t RegExpMacroAssemblerMIPS::CheckStackGuardState(Address* return_address,
+                                                       Code* re_code,
+                                                       Address re_frame) {
   Isolate* isolate = frame_entry<Isolate*>(re_frame, kIsolate);
   StackLimitCheck check(isolate);
   if (check.JsHasOverflowed()) {
     isolate->StackOverflow();
     return EXCEPTION;
   }
 
   // If not real stack overflow the stack guard was used to interrupt
   // execution for another purpose.
 
@@ skipping 199 matching lines @@
   }
 }
 
 #undef __
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }}  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS64