[turbofan] load elimination looks through TypeGuards

src/compiler/load-elimination.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/load-elimination.h"
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/simplified-operator.h"
@@ skipping 19 matching lines @@
         case IrOpcode::kAllocate:
         case IrOpcode::kHeapConstant:
         case IrOpcode::kParameter:
           return kNoAlias;
         default:
           break;
       }
       break;
     }
     case IrOpcode::kFinishRegion:
+    case IrOpcode::kTypeGuard:
       return QueryAlias(a, b->InputAt(0));
     default:
       break;
   }
   switch (a->opcode()) {
     case IrOpcode::kAllocate: {
       switch (b->opcode()) {
         case IrOpcode::kHeapConstant:
         case IrOpcode::kParameter:
           return kNoAlias;
         default:
           break;
       }
       break;
     }
     case IrOpcode::kFinishRegion:
+    case IrOpcode::kTypeGuard:
       return QueryAlias(a->InputAt(0), b);
     default:
       break;
   }
   return kMayAlias;
 }
 
 bool MayAlias(Node* a, Node* b) { return QueryAlias(a, b) != kNoAlias; }
 
 bool MustAlias(Node* a, Node* b) { return QueryAlias(a, b) == kMustAlias; }
@@ skipping 1036 matching lines @@
   return jsgraph()->common();
 }
 
 Graph* LoadElimination::graph() const { return jsgraph()->graph(); }
 
 Factory* LoadElimination::factory() const { return jsgraph()->factory(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8