Eliminate dependencies on assemblers and code stubs in precompiled runtime.

runtime/lib/errors.cc

Index: runtime/lib/errors.cc
diff --git a/runtime/lib/errors.cc b/runtime/lib/errors.cc
index a4a738bd9862ce21888838c61b2c440568078071..dc84b17ea842f1fbe66fa173ea5a7c4d96254592 100644
--- a/runtime/lib/errors.cc
+++ b/runtime/lib/errors.cc
@@ -14,15 +14,15 @@ namespace dart {
 // Scan the stack until we hit the first function in the _AssertionError
 // class. We then return the next frame's script taking inlining into account.
 static RawScript* FindScript(DartFrameIterator* iterator) {
-  if (FLAG_precompiled_runtime) {
-    // The precompiled runtime faces two issues in recovering the correct
-    // assertion text. First, the precompiled runtime does not include
-    // the inlining meta-data so we cannot walk the inline-aware stack trace.
-    // Second, the script text itself is missing so whatever script is returned
-    // from here will be missing the assertion expression text.
-    iterator->NextFrame();  // Skip _AssertionError._evaluateAssertion frame
-    return Exceptions::GetCallerScript(iterator);
-  }
+#if defined(DART_PRECOMPILED_RUNTIME)
+  // The precompiled runtime faces two issues in recovering the correct
+  // assertion text. First, the precompiled runtime does not include
+  // the inlining meta-data so we cannot walk the inline-aware stack trace.
+  // Second, the script text itself is missing so whatever script is returned
+  // from here will be missing the assertion expression text.
+  iterator->NextFrame();  // Skip _AssertionError._evaluateAssertion frame
+  return Exceptions::GetCallerScript(iterator);
+#else
   StackFrame* stack_frame = iterator->NextFrame();
   Code& code = Code::Handle();
   Function& func = Function::Handle();
@@ -56,6 +56,7 @@ static RawScript* FindScript(DartFrameIterator* iterator) {
   }
   UNREACHABLE();
   return Script::null();
+#endif  // defined(DART_PRECOMPILED_RUNTIME)
 }