Port count-based profiler to x64

src/runtime-profiler.cc

Index: src/runtime-profiler.cc
diff --git a/src/runtime-profiler.cc b/src/runtime-profiler.cc
index 04aa02edb3c8d8723a992ccf82e9eb5422bc146b..20960592eae75a5236268c19af8512a03e8f9cac 100644
--- a/src/runtime-profiler.cc
+++ b/src/runtime-profiler.cc
@@ -175,14 +175,10 @@ void RuntimeProfiler::AttemptOnStackReplacement(JSFunction* function) {
   // prepared to generate it, but we don't expect to have to.
   bool found_code = false;
   Code* stack_check_code = NULL;
-#if defined(V8_TARGET_ARCH_IA32) || \
-    defined(V8_TARGET_ARCH_ARM) || \
-    defined(V8_TARGET_ARCH_MIPS)
   if (FLAG_count_based_interrupts) {
     InterruptStub interrupt_stub;
     found_code = interrupt_stub.FindCodeInCache(&stack_check_code);
   } else  // NOLINT
-#endif
   {  // NOLINT
     StackCheckStub check_stub;
     found_code = check_stub.FindCodeInCache(&stack_check_code);
@@ -353,11 +349,7 @@ void RuntimeProfiler::OptimizeNow() {
 
 
 void RuntimeProfiler::NotifyTick() {
-#if defined(V8_TARGET_ARCH_IA32) || \
-    defined(V8_TARGET_ARCH_ARM) || \
-    defined(V8_TARGET_ARCH_MIPS)
   if (FLAG_count_based_interrupts) return;
-#endif
   isolate_->stack_guard()->RequestRuntimeProfilerTick();
 }