Fix several bugs in closure conversion.

runtime/vm/flow_graph_compiler_arm.cc

Index: runtime/vm/flow_graph_compiler_arm.cc
diff --git a/runtime/vm/flow_graph_compiler_arm.cc b/runtime/vm/flow_graph_compiler_arm.cc
index 5dec2e5bdc08c92cd6b015ead766c813548d02c4..495a884fee5136bfd9f9acf7585877f866def29d 100644
--- a/runtime/vm/flow_graph_compiler_arm.cc
+++ b/runtime/vm/flow_graph_compiler_arm.cc
@@ -765,7 +765,8 @@ void FlowGraphCompiler::CopyParameters() {
 #ifdef DEBUG
   const bool check_correct_named_args = true;
 #else
-  const bool check_correct_named_args = function.IsClosureFunction();
+  const bool check_correct_named_args =
+      function.IsClosureFunction() || function.IsConvertedClosureFunction();
 #endif
   if (num_opt_named_params > 0) {
     // Start by alphabetically sorting the names of the optional parameters.
@@ -873,7 +874,7 @@ void FlowGraphCompiler::CopyParameters() {
   }
 
   __ Bind(&wrong_num_arguments);
-  if (function.IsClosureFunction()) {
+  if (function.IsClosureFunction() || function.IsConvertedClosureFunction()) {
     __ LeaveDartFrame(kKeepCalleePP);  // The arguments are still on the stack.
     __ Branch(*StubCode::CallClosureNoSuchMethod_entry());
     // The noSuchMethod call may return to the caller, but not here.
@@ -997,8 +998,9 @@ void FlowGraphCompiler::CompileGraph() {
   // No such checking code is generated if only fixed parameters are declared,
   // unless we are in debug mode or unless we are compiling a closure.
   if (num_copied_params == 0) {
-    const bool check_arguments =
-        function.IsClosureFunction() && !flow_graph().IsCompiledForOsr();
+    const bool check_arguments = (function.IsClosureFunction() ||
+                                  function.IsConvertedClosureFunction()) &&
+                                 !flow_graph().IsCompiledForOsr();
     if (check_arguments) {
       __ Comment("Check argument count");
       // Check that exactly num_fixed arguments are passed in.