[turbofan] Bailout if LoadBuffer typing assumption doesn't hold.

src/compiler/simplified-lowering.cc

 // Copyright 2014 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/simplified-lowering.h"
 
 #include <limits>
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 1181 matching lines @@
           } else {
             // If undefined is truncated to a number, but the use can
             // observe NaN, we need to output at least the float32
             // representation.
             if (access.machine_type().representation() ==
                 MachineRepresentation::kFloat32) {
               output_info =
                   NodeOutputInfo(access.machine_type().representation(),
                                  NodeProperties::GetType(node));
             } else {
+              if (access.machine_type().representation() !=
+                  MachineRepresentation::kFloat64) {
+                // TODO(bmeurer): See comment on abort_compilation_.
+                if (lower()) lowering->abort_compilation_ = true;
+              }
               output_info = NodeOutputInfo::Float64();
             }
           }
         } else {
+          // TODO(bmeurer): See comment on abort_compilation_.
+          if (lower()) lowering->abort_compilation_ = true;
+
           // If undefined is not truncated away, we need to have the tagged
           // representation.
           output_info = NodeOutputInfo::AnyTagged();
         }
         SetOutput(node, output_info);
         if (lower())
           lowering->DoLoadBuffer(node, output_info.representation(), changer_);
         break;
       }
       case IrOpcode::kStoreBuffer: {
@@ skipping 698 matching lines @@
   ReplaceEffectUses(node, comparison);
   node->ReplaceInput(0, comparison);
   node->ReplaceInput(1, jsgraph()->SmiConstant(EQUAL));
   node->TrimInputCount(2);
   NodeProperties::ChangeOp(node, machine()->IntLessThanOrEqual());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8