Eliminate dependencies on assemblers and code stubs in precompiled runtime.

runtime/vm/stub_code_dbc.cc

Index: runtime/vm/stub_code_dbc.cc
diff --git a/runtime/vm/stub_code_dbc.cc b/runtime/vm/stub_code_dbc.cc
index 4ada569f801b9d9d1effffb6ace96185c3e6b9b3..16a85f01f4ee3ea9822b340ccdcad2fcbb9802ee 100644
--- a/runtime/vm/stub_code_dbc.cc
+++ b/runtime/vm/stub_code_dbc.cc
@@ -98,13 +98,6 @@ void StubCode::GenerateAsynchronousGapMarkerStub(Assembler* assembler) {
   __ Trap();
 }
 
-
-// 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
-
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_DBC