Eliminate dependencies on assemblers and code stubs in precompiled runtime.

runtime/vm/runtime_entry.cc

Index: runtime/vm/runtime_entry.cc
diff --git a/runtime/vm/runtime_entry.cc b/runtime/vm/runtime_entry.cc
index 3504e78830f6893a95ed14df30445eecf325dced..7bad4f671ffcf66a3a14e14c8ac1e151a3967c06 100644
--- a/runtime/vm/runtime_entry.cc
+++ b/runtime/vm/runtime_entry.cc
@@ -1749,10 +1749,11 @@ DEFINE_RUNTIME_ENTRY(StackOverflow, 0) {
 #ifndef DART_PRECOMPILED_RUNTIME
       // Ensure that we have unoptimized code.
       frame->function().EnsureHasCompiledUnoptimizedCode();
-#endif
+      const int num_vars = frame->NumLocalVariables();
+#else
       // Variable locations and number are unknown when precompiling.
-      const int num_vars =
-          FLAG_precompiled_runtime ? 0 : frame->NumLocalVariables();
+      const int num_vars = 0;
+#endif
       TokenPosition unused = TokenPosition::kNoSource;
       for (intptr_t v = 0; v < num_vars; v++) {
         frame->VariableAt(v, &var_name, &unused, &unused, &unused, &var_value);
@@ -2341,6 +2342,14 @@ DEFINE_RUNTIME_ENTRY(InitStaticField, 1) {
   field.EvaluateInitializer();
 }
 
+
+// Print the stop message.
+DEFINE_LEAF_RUNTIME_ENTRY(void, PrintStopMessage, 1, const char* message) {
+  OS::Print("Stop message: %s\n", message);
+}
+END_LEAF_RUNTIME_ENTRY
+
+
 // Use expected function signatures to help MSVC compiler resolve overloading.
 typedef double (*UnaryMathCFunction)(double x);
 typedef double (*BinaryMathCFunction)(double x, double y);