Reapply "Lazy deopt without code patching."

runtime/vm/flow_graph_compiler.cc

 // Copyright (c) 2013, 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_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
@@ skipping 207 matching lines @@
             isolate()->object_store()->float32x4_class())),
         float64x2_class_(Class::ZoneHandle(
             isolate()->object_store()->float64x2_class())),
         int32x4_class_(Class::ZoneHandle(
             isolate()->object_store()->int32x4_class())),
         list_class_(Class::ZoneHandle(
             Library::Handle(Library::CoreLibrary()).
                 LookupClass(Symbols::List()))),
         parallel_move_resolver_(this),
         pending_deoptimization_env_(NULL),
-        lazy_deopt_return_pc_offset_(Code::kInvalidPc),
-        lazy_deopt_throw_pc_offset_(Code::kInvalidPc),
         deopt_id_to_ic_data_(NULL),
         edge_counters_array_(Array::ZoneHandle()),
         inlined_code_intervals_(Array::ZoneHandle(Object::empty_array().raw())),
         inline_id_to_function_(inline_id_to_function),
         inline_id_to_token_pos_(inline_id_to_token_pos),
         caller_inline_id_(caller_inline_id) {
   ASSERT(flow_graph->parsed_function().function().raw() ==
          parsed_function.function().raw());
   if (!is_optimizing) {
     const intptr_t len = thread()->deopt_id();
@@ skipping 784 matching lines @@
   }
 }
 
 
 void FlowGraphCompiler::FinalizePcDescriptors(const Code& code) {
   ASSERT(pc_descriptors_list_ != NULL);
   const PcDescriptors& descriptors = PcDescriptors::Handle(
       pc_descriptors_list_->FinalizePcDescriptors(code.PayloadStart()));
   if (!is_optimizing_) descriptors.Verify(parsed_function_.function());
   code.set_pc_descriptors(descriptors);
-  code.set_lazy_deopt_return_pc_offset(lazy_deopt_return_pc_offset_);
-  code.set_lazy_deopt_throw_pc_offset(lazy_deopt_throw_pc_offset_);
 }
 
 
 RawArray* FlowGraphCompiler::CreateDeoptInfo(Assembler* assembler) {
   // No deopt information if we precompile (no deoptimization allowed).
   if (FLAG_precompiled_mode) {
     return Array::empty_array().raw();
   }
   // For functions with optional arguments, all incoming arguments are copied
   // to spill slots. The deoptimization environment does not track them.
@@ skipping 949 matching lines @@
 
 
 void FlowGraphCompiler::FrameStateClear() {
   ASSERT(!is_optimizing());
   frame_state_.TruncateTo(0);
 }
 #endif  // defined(DEBUG) && !defined(TARGET_ARCH_DBC)
 
 
 }  // namespace dart