Remember deopt-id -> context-level mappings in var descriptors.

runtime/vm/intermediate_language_arm64.cc

 // Copyright (c) 2014, 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_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/compiler.h"
@@ skipping 5953 matching lines @@
 
 
 Condition StrictCompareInstr::EmitComparisonCode(FlowGraphCompiler* compiler,
                                                  BranchLabels labels) {
   Location left = locs()->in(0);
   Location right = locs()->in(1);
   ASSERT(!left.IsConstant() || !right.IsConstant());
   Condition true_condition;
   if (left.IsConstant()) {
     true_condition = compiler->EmitEqualityRegConstCompare(
-        right.reg(), left.constant(), needs_number_check(), token_pos());
+        right.reg(), left.constant(), needs_number_check(), token_pos(),
+        deopt_id_);
   } else if (right.IsConstant()) {
     true_condition = compiler->EmitEqualityRegConstCompare(
-        left.reg(), right.constant(), needs_number_check(), token_pos());
+        left.reg(), right.constant(), needs_number_check(), token_pos(),
+        deopt_id_);
   } else {
     true_condition = compiler->EmitEqualityRegRegCompare(
-        left.reg(), right.reg(), needs_number_check(), token_pos());
+        left.reg(), right.reg(), needs_number_check(), token_pos(), deopt_id_);
   }
   if (kind() != Token::kEQ_STRICT) {
     ASSERT(kind() == Token::kNE_STRICT);
     true_condition = NegateCondition(true_condition);
   }
   return true_condition;
 }
 
 
 void StrictCompareInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
@@ skipping 57 matching lines @@
   compiler->GenerateCall(token_pos(), stub_entry, RawPcDescriptors::kOther,
                          locs());
   compiler->AddStubCallTarget(stub);
   __ Drop(ArgumentCount());  // Discard arguments.
 }
 
 
 void DebugStepCheckInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   ASSERT(!compiler->is_optimizing());
   __ BranchLinkPatchable(*StubCode::DebugStepCheck_entry());
-  compiler->AddCurrentDescriptor(stub_kind_, Thread::kNoDeoptId, token_pos());
+  compiler->AddCurrentDescriptor(stub_kind_, deopt_id_, token_pos());
   compiler->RecordSafepoint(locs());
 }
 
 
 LocationSummary* GrowRegExpStackInstr::MakeLocationSummary(Zone* zone,
                                                            bool opt) const {
   const intptr_t kNumInputs = 1;
   const intptr_t kNumTemps = 0;
   LocationSummary* locs = new (zone)
       LocationSummary(zone, kNumInputs, kNumTemps, LocationSummary::kCall);
@@ skipping 11 matching lines @@
   compiler->GenerateRuntimeCall(TokenPosition::kNoSource, deopt_id(),
                                 kGrowRegExpStackRuntimeEntry, 1, locs());
   __ Drop(1);
   __ Pop(result);
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM64