Remove default monomorphic check code from functions and stubs that do not need it.

runtime/vm/flow_graph_compiler_x64.cc

Index: runtime/vm/flow_graph_compiler_x64.cc
diff --git a/runtime/vm/flow_graph_compiler_x64.cc b/runtime/vm/flow_graph_compiler_x64.cc
index bc7139c6d7f7156dc187e3937fe417f7731056b6..db309c23d635ae11c07a63acc14e39e61c307a3c 100644
--- a/runtime/vm/flow_graph_compiler_x64.cc
+++ b/runtime/vm/flow_graph_compiler_x64.cc
@@ -984,9 +984,6 @@ void FlowGraphCompiler::GenerateInlinedSetter(intptr_t offset) {
 // NOTE: If the entry code shape changes, ReturnAddressLocator in profiler.cc
 // needs to be updated to match.
 void FlowGraphCompiler::EmitFrameEntry() {
-  const Function& function = parsed_function().function();
-  // Load pool pointer.
-
   if (flow_graph().IsCompiledForOsr()) {
     intptr_t extra_slots = StackSize()
         - flow_graph().num_stack_locals()
@@ -997,6 +994,7 @@ void FlowGraphCompiler::EmitFrameEntry() {
     const Register new_pp = R13;
     __ LoadPoolPointer(new_pp);
 
+    const Function& function = parsed_function().function();
     if (CanOptimizeFunction() &&
         function.IsOptimizable() &&
         (!is_optimizing() || may_reoptimize())) {
@@ -1027,6 +1025,13 @@ void FlowGraphCompiler::EmitFrameEntry() {
 
 void FlowGraphCompiler::CompileGraph() {
   InitCompiler();
+  const Function& function = parsed_function().function();
+
+#ifdef DART_PRECOMPILER
+  if (function.IsDynamicFunction()) {
+    __ MonomorphicCheckedEntry();
+  }
+#endif  // DART_PRECOMPILER
 
   if (TryIntrinsify()) {
     // Skip regular code generation.
@@ -1036,8 +1041,6 @@ void FlowGraphCompiler::CompileGraph() {
   EmitFrameEntry();
   ASSERT(assembler()->constant_pool_allowed());
 
-  const Function& function = parsed_function().function();
-
   const int num_fixed_params = function.num_fixed_parameters();
   const int num_copied_params = parsed_function().num_copied_params();
   const int num_locals = parsed_function().num_stack_locals();