[standalone] Register a segfault handler on Android as already done on Linux.

runtime/vm/profiler.cc

Index: runtime/vm/profiler.cc
diff --git a/runtime/vm/profiler.cc b/runtime/vm/profiler.cc
index 3059a2040df7d085f10221e907d6e8e0cc92fcc5..3dc4c8faf53da444e6e3e71170ac250c6c59d92c 100644
--- a/runtime/vm/profiler.cc
+++ b/runtime/vm/profiler.cc
@@ -1035,7 +1035,7 @@ static bool CheckIsolate(Isolate* isolate) {
 }
 
 void Profiler::DumpStackTrace(void* context) {
-#if defined(HOST_OS_LINUX) || defined(HOST_OS_MACOS)
+#if defined(HOST_OS_LINUX) || defined(HOST_OS_MACOS) || defined(HOST_OS_ANDROID)
   ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context);
   mcontext_t mcontext = ucontext->uc_mcontext;
   uword pc = SignalHandler::GetProgramCounter(mcontext);
@@ -1085,12 +1085,14 @@ void Profiler::DumpStackTrace(uword sp, uword fp, uword pc, bool for_crash) {
 
   Thread* thread = Thread::Current();
   if (thread == NULL) {
+    OS::PrintErr("Stack dump aborted because no current Dart thread.\n");
     return;
   }
   OSThread* os_thread = thread->os_thread();
   ASSERT(os_thread != NULL);
   Isolate* isolate = thread->isolate();
   if (!CheckIsolate(isolate)) {
+    OS::PrintErr("Stack dump aborted because CheckIsolate.\n");

[siva, 2017/07/27 01:09:52]

"...... CheckIsolate failed.\n"

[rmacnak, 2017/07/27 01:23:27]

Done, and similar messages below.

     return;
   }