[VM DBC compiler and simulator] Support reified generic functions.

runtime/vm/flow_graph_compiler_dbc.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_DBC.
 #if defined(TARGET_ARCH_DBC)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 388 matching lines @@
     }
     __ LoadField(context_reg, closure_reg,
                  Closure::context_offset() / kWordSize);
   } else if (has_optional_params && !is_optimizing()) {
     __ LoadConstant(context_index, Object::empty_context());
   }
 
   // Check for a passed type argument vector if the function is generic.
   if (FLAG_reify_generic_functions && function.IsGeneric() &&
       !flow_graph().IsCompiledForOsr()) {
-    __ Comment("Check passed-in type args");
-    UNIMPLEMENTED();  // TODO(regis): Not yet supported.
+    __ CheckFunctionTypeArgs(function.NumTypeParameters(),
+                             -parsed_function().first_stack_local_index() - 1);
   }
+
+  // TODO(regis): Verify that no vector is passed if not generic, unless already
+  // checked during resolution.
 }
 
 void FlowGraphCompiler::CompileGraph() {
   InitCompiler();
 
   if (TryIntrinsify()) {
     // Skip regular code generation.
     return;
   }
 
@@ skipping 124 matching lines @@
 
 void ParallelMoveResolver::RestoreFpuScratch(FpuRegister reg) {
   UNIMPLEMENTED();
 }
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_DBC