Interpreter can kick in even when implicit checks are enabled.

Add a GetStackEndForInterpreter for its stack overfow check.

Change-Id: I2d4fc229a8eb727fda509ff778e16d60d96ecc28
diff --git a/runtime/runtime.cc b/runtime/runtime.cc
index aca2607..0398365 100644
--- a/runtime/runtime.cc
+++ b/runtime/runtime.cc
@@ -629,8 +629,7 @@
       break;
   }
 
-  if (!options->interpreter_only_ &&
-    (implicit_null_checks_ || implicit_so_checks_ || implicit_suspend_checks_)) {
+  if (implicit_null_checks_ || implicit_so_checks_ || implicit_suspend_checks_) {
     fault_manager.Init();
 
     // These need to be in a specific order.  The null point check handler must be