Fix product and Mac build.

BUG=

Review URL: https://codereview.chromium.org/2518063008 .

runtime/bin/platform_linux.cc

@@ -22,12 +22,12 @@ char* Platform::resolved_executable_name_ = NULL;
 int Platform::script_index_ = 1;
 char** Platform::argv_ = NULL;
 
-
 static void segv_handler(int signal, siginfo_t* siginfo, void* context) {
   Dart_DumpNativeStackTrace(context);
   abort();
 }
 
+
 bool Platform::Initialize() {
   // Turn off the signal handler for SIGPIPE as it causes the process
   // to terminate on writing to a closed pipe. Without the signal

runtime/bin/platform_macos.cc

@@ -28,6 +28,12 @@ char* Platform::resolved_executable_name_ = NULL;
 int Platform::script_index_ = 1;
 char** Platform::argv_ = NULL;
 
+static void segv_handler(int signal, siginfo_t* siginfo, void* context) {
+  Dart_DumpNativeStackTrace(context);
+  abort();
+}
+
+
 bool Platform::Initialize() {
   // Turn off the signal handler for SIGPIPE as it causes the process
   // to terminate on writing to a closed pipe. Without the signal

runtime/vm/dart_api_impl.cc

@@ -6673,7 +6673,9 @@ DART_EXPORT bool Dart_IsPrecompiledRuntime() {
 
 
 DART_EXPORT void Dart_DumpNativeStackTrace(void* context) {
+#ifndef PRODUCT
   Profiler::DumpStackTrace(context);
+#endif
 }
 
 }  // namespace dart