VM: Add dart_precompiled build target, a standalone VM without the JIT compiler.

runtime/vm/isolate.cc

Index: runtime/vm/isolate.cc
diff --git a/runtime/vm/isolate.cc b/runtime/vm/isolate.cc
index 1a098fa78fa8b2587fea530accbbe10c0d887853..4c49953b5ad2756c4d56135e43830a5dc26868dc 100644
--- a/runtime/vm/isolate.cc
+++ b/runtime/vm/isolate.cc
@@ -1639,7 +1639,9 @@ void Isolate::LowLevelShutdown() {
 void Isolate::Shutdown() {
   ASSERT(this == Isolate::Current());
   // Wait until all background compilation has finished.
-  BackgroundCompiler::Stop(background_compiler_);
+  if (background_compiler_ != NULL) {
+    BackgroundCompiler::Stop(background_compiler_);
+  }

[rmacnak, 2015/11/17 20:51:18]

else {
  ASSERT(Dart::IsRunningPrecompiledCode())
}

[Florian Schneider, 2015/11/18 11:44:09]

This may be too strict - e.g. running with --no-background-compilation should be
allowed to leave this field NULL, too.

[rmacnak, 2015/11/18 19:00:07]

Ack.

 
 #if defined(DEBUG)
   if (heap_ != NULL) {