VM: [KERNEL] handle single-argument string interpolation in VM

runtime/vm/kernel_to_il.h

 // 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.
 
 #ifndef RUNTIME_VM_KERNEL_TO_IL_H_
 #define RUNTIME_VM_KERNEL_TO_IL_H_
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 
 #include "vm/growable_array.h"
@@ skipping 858 matching lines @@
       const dart::Field& field,
       bool is_initialization_store,
       StoreBarrierType emit_store_barrier = kEmitStoreBarrier);
   Fragment StoreInstanceField(
       TokenPosition position,
       intptr_t offset,
       StoreBarrierType emit_store_barrier = kEmitStoreBarrier);
   Fragment StoreLocal(TokenPosition position, LocalVariable* variable);
   Fragment StoreStaticField(TokenPosition position, const dart::Field& field);
   Fragment StringInterpolate(TokenPosition position);
+  Fragment StringInterpolateSingle(TokenPosition position);
   Fragment ThrowTypeError();
   Fragment ThrowNoSuchMethodError();
   Fragment BuildImplicitClosureCreation(const Function& target);
   Fragment GuardFieldLength(const dart::Field& field, intptr_t deopt_id);
   Fragment GuardFieldClass(const dart::Field& field, intptr_t deopt_id);
 
   Fragment EvaluateAssertion();
   Fragment CheckReturnTypeInCheckedMode();
   Fragment CheckVariableTypeInCheckedMode(VariableDeclaration* variable);
   Fragment CheckBooleanInCheckedMode();
@@ skipping 141 matching lines @@
 namespace kernel {
 
 RawObject* EvaluateMetadata(TreeNode* const kernel_node);
 RawObject* BuildParameterDescriptor(TreeNode* const kernel_node);
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)
 #endif  // RUNTIME_VM_KERNEL_TO_IL_H_