[turbofan] Support lazy deopt for truncating store to a typed array.

src/compiler/operator-properties.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/operator-properties.h"
 
 #include "src/compiler/js-operator.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/opcodes.h"
 
@@ skipping 46 matching lines @@
     // Conversions
     case IrOpcode::kJSToObject:
     case IrOpcode::kJSToNumber:
     case IrOpcode::kJSToName:
 
     // Misc operations
     case IrOpcode::kJSStackCheck:
 
     // Properties
     case IrOpcode::kJSLoadNamed:
+    case IrOpcode::kJSStoreNamed:
     case IrOpcode::kJSLoadProperty:
-    case IrOpcode::kJSStoreNamed:
-    case IrOpcode::kJSStoreProperty:
     case IrOpcode::kJSDeleteProperty:
       return 1;
 
+    // StoreProperty provides a second frame state just before
+    // the operation. This is used to lazy-deoptimize a to-number
+    // conversion for typed arrays.
+    case IrOpcode::kJSStoreProperty:
+      return 2;
+
     // Binary operators that can deopt in the middle the operation (e.g.,
     // as a result of lazy deopt in ToNumber conversion) need a second frame
     // state so that we can resume before the operation.
     case IrOpcode::kJSMultiply:
     case IrOpcode::kJSAdd:
     case IrOpcode::kJSBitwiseAnd:
     case IrOpcode::kJSBitwiseOr:
     case IrOpcode::kJSBitwiseXor:
     case IrOpcode::kJSDivide:
     case IrOpcode::kJSModulus:
@@ skipping 24 matching lines @@
          opcode == IrOpcode::kDead || opcode == IrOpcode::kLoop ||
          opcode == IrOpcode::kMerge || opcode == IrOpcode::kIfTrue ||
          opcode == IrOpcode::kIfFalse || opcode == IrOpcode::kIfSuccess ||
          opcode == IrOpcode::kIfException || opcode == IrOpcode::kIfValue ||
          opcode == IrOpcode::kIfDefault;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8