Revert "Switch on implicit null pointer and stack overflow checks."

This seems to break facebook

This reverts commit 052664322767de1799f060c306e729b0e73ce893.

Change-Id: I6c8dabdc2519c0925ffde41975878f821e3933de
diff --git a/runtime/fault_handler.cc b/runtime/fault_handler.cc
index 0a35054..b8093bc 100644
--- a/runtime/fault_handler.cc
+++ b/runtime/fault_handler.cc
@@ -35,13 +35,6 @@
 // Static fault manger object accessed by signal handler.
 FaultManager fault_manager;
 
-extern "C" {
-void art_sigsegv_fault() {
-  // Set a breakpoint here to be informed when a SIGSEGV is unhandled by ART.
-  LOG(ERROR)<< "Caught unknown SIGSEGV in ART fault handler";
-}
-}
-
 // Signal handler called on SIGSEGV.
 static void art_fault_handler(int sig, siginfo_t* info, void* context) {
   fault_manager.HandleFault(sig, info, context);
@@ -82,10 +75,7 @@
       return;
     }
   }
-
-  // Allow the user to catch this problem with a simple breakpoint in art_sigsegv_fault.
-  art_sigsegv_fault();
-
+  LOG(ERROR)<< "Caught unknown SIGSEGV in ART fault handler";
   oldaction_.sa_sigaction(sig, info, context);
 }