[turbofan] Replace uninitialized JSConstruct nodes with SOFT deopt.

src/compiler/js-call-reducer.h

 // Copyright 2015 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.
 
 #ifndef V8_COMPILER_JS_CALL_REDUCER_H_
 #define V8_COMPILER_JS_CALL_REDUCER_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/graph-reducer.h"
+#include "src/deoptimize-reason.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class CompilationDependencies;
 class Factory;
 
 namespace compiler {
 
@@ skipping 43 matching lines @@
   Reduction ReduceCallOrConstructWithArrayLikeOrSpread(
       Node* node, int arity, CallFrequency const& frequency);
   Reduction ReduceJSConstruct(Node* node);
   Reduction ReduceJSConstructWithArrayLike(Node* node);
   Reduction ReduceJSConstructWithSpread(Node* node);
   Reduction ReduceJSCall(Node* node);
   Reduction ReduceJSCallWithArrayLike(Node* node);
   Reduction ReduceJSCallWithSpread(Node* node);
   Reduction ReduceReturnReceiver(Node* node);
 
+  Reduction ReduceSoftDeoptimize(Node* node, DeoptimizeReason reason);
+
   Graph* graph() const;
   JSGraph* jsgraph() const { return jsgraph_; }
   Isolate* isolate() const;
   Factory* factory() const;
   Handle<Context> native_context() const { return native_context_; }
   Handle<JSGlobalProxy> global_proxy() const;
   CommonOperatorBuilder* common() const;
   JSOperatorBuilder* javascript() const;
   SimplifiedOperatorBuilder* simplified() const;
   Flags flags() const { return flags_; }
   CompilationDependencies* dependencies() const { return dependencies_; }
 
   JSGraph* const jsgraph_;
   Flags const flags_;
   Handle<Context> const native_context_;
   CompilationDependencies* const dependencies_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_CALL_REDUCER_H_