Clean up global variables related to precompilation.

runtime/vm/weak_code.cc

Index: runtime/vm/weak_code.cc
diff --git a/runtime/vm/weak_code.cc b/runtime/vm/weak_code.cc
index 7c817d03ab8843fdd9c34869e75e3b5c926fb9b6..6c654054772b5ebee3633669496b77f2e7c8c951 100644
--- a/runtime/vm/weak_code.cc
+++ b/runtime/vm/weak_code.cc
@@ -14,6 +14,8 @@
 
 namespace dart {
 
+DECLARE_FLAG(bool, precompilation);
+
 bool WeakCodeReferences::HasCodes() const {
   return !array_.IsNull() && (array_.Length() > 0);
 }
@@ -67,7 +69,7 @@ void WeakCodeReferences::DisableCode() {
   if (code_objects.IsNull()) {
     return;
   }
-  ASSERT(Compiler::allow_recompilation());
+  ASSERT(!FLAG_precompilation);
   UpdateArrayTo(Object::null_array());
   // Disable all code on stack.
   Code& code = Code::Handle();