Clean up global variables related to precompilation.

runtime/vm/debugger.cc

Index: runtime/vm/debugger.cc
diff --git a/runtime/vm/debugger.cc b/runtime/vm/debugger.cc
index 4fc7fe6cd24444b1dea6b42e29f94cca9c1937bb..2fe6e8c60ba25e8d40dc0792f5b13931f66f7f2c 100644
--- a/runtime/vm/debugger.cc
+++ b/runtime/vm/debugger.cc
@@ -45,6 +45,7 @@ DEFINE_FLAG(bool, steal_breakpoints, false,
 
 DECLARE_FLAG(bool, trace_isolates);
 DECLARE_FLAG(bool, warn_on_pause_with_no_debugger);
+DECLARE_FLAG(bool, precompilation);
 
 
 Debugger::EventHandler* Debugger::event_handler_ = NULL;
@@ -1485,7 +1486,7 @@ DebuggerStackTrace* Debugger::CollectStackTrace() {
     }
     if (frame->IsDartFrame()) {
       code = frame->LookupDartCode();
-      if (code.is_optimized() && !Compiler::always_optimize()) {
+      if (code.is_optimized() && !FLAG_precompilation) {
         deopt_frame = DeoptimizeToArray(thread, frame, code);
         for (InlinedFunctionsIterator it(code, frame->pc());
              !it.Done();