VM(RegExp): Allow OSR optimization of RegExp :matcher functions.

runtime/vm/kernel_binary_flowgraph.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/kernel_binary_flowgraph.h"
 
 #include "vm/compiler.h"
 #include "vm/longjump.h"
 #include "vm/object_store.h"
 
@@ skipping 3310 matching lines @@
       ASSERT(check_pos.IsDebugPause());
     }
 
     // TODO(29737): This sequence should be generated in order.
     body = DebugStepCheck(check_pos) + body;
     flow_graph_builder_->context_depth_ = current_context_depth;
   }
 
   normal_entry->LinkTo(body.entry);
 
+  GraphEntryInstr* graph_entry = flow_graph_builder_->graph_entry_;
   // When compiling for OSR, use a depth first search to prune instructions
   // unreachable from the OSR entry. Catch entries are always considered
   // reachable, even if they become unreachable after OSR.
   if (flow_graph_builder_->osr_id_ != Compiler::kNoOSRDeoptId) {
-    BitVector* block_marks =
-        new (Z) BitVector(Z, flow_graph_builder_->next_block_id_);
-    bool found = flow_graph_builder_->graph_entry_->PruneUnreachable(
-        flow_graph_builder_->graph_entry_, NULL, flow_graph_builder_->osr_id_,
-        block_marks);
-    ASSERT(found);
+    graph_entry->PruneUnreachableForOSR(Z, flow_graph_builder_->next_block_id_);
   }
-  return new (Z)
-      FlowGraph(*parsed_function(), flow_graph_builder_->graph_entry_,
-                flow_graph_builder_->next_block_id_ - 1);
+  return new (Z) FlowGraph(*parsed_function(), graph_entry,
+                           flow_graph_builder_->next_block_id_ - 1);
 }
 
 Fragment StreamingFlowGraphBuilder::BuildGetMainClosure() {
   // _getMainClosure in dart:_builtin. Compile that one specially here.
   const dart::Library& builtin =
       dart::Library::Handle(Z, I->object_store()->builtin_library());
   const Object& main =
       Object::Handle(Z, builtin.LookupObjectAllowPrivate(dart::String::Handle(
                             Z, dart::String::New("main"))));
   if (main.IsField()) {
@@ skipping 3587 matching lines @@
     metadata_values.SetAt(i, value);
   }
 
   return metadata_values.raw();
 }
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)