Fix SafePrettyTypeOf to never call VerifyObject.

Calling VerifyObject from the segfault handler caused another
segfault.

Change-Id: I459646594d830cbb110a4ac2bac25a7b90794854
diff --git a/runtime/runtime_android.cc b/runtime/runtime_android.cc
index 14e5574..a237722 100644
--- a/runtime/runtime_android.cc
+++ b/runtime/runtime_android.cc
@@ -27,6 +27,8 @@
 
 namespace art {
 
+static constexpr bool kDumpHeapObjectOnSigsevg = false;
+
 struct sigaction old_action;
 void HandleUnexpectedSignal(int signal_number, siginfo_t* info, void* raw_context) {
   static bool handlingUnexpectedSignal = false;
@@ -44,7 +46,7 @@
     // Print this out first in case DumpObject faults.
     LOG(INTERNAL_FATAL) << "Fault message: " << runtime->GetFaultMessage();
     gc::Heap* heap = runtime->GetHeap();
-    if (heap != nullptr && info != nullptr) {
+    if (kDumpHeapObjectOnSigsevg && heap != nullptr && info != nullptr) {
       LOG(INTERNAL_FATAL) << "Dump heap object at fault address: ";
       heap->DumpObject(LOG(INTERNAL_FATAL), reinterpret_cast<mirror::Object*>(info->si_addr));
     }