[turbofan] Add support for SOFT deopts and use that for property access.

src/compiler.h

 // Copyright 2012 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_H_
 #define V8_COMPILER_H_
 
 #include "src/allocation.h"
 #include "src/ast/ast.h"
 #include "src/bailout-reason.h"
@@ skipping 46 matching lines @@
     kFunctionContextSpecializing = 1 << 8,
     kFrameSpecializing = 1 << 9,
     kNativeContextSpecializing = 1 << 10,
     kInliningEnabled = 1 << 11,
     kTypingEnabled = 1 << 12,
     kDisableFutureOptimization = 1 << 13,
     kSplittingEnabled = 1 << 14,
     kDeoptimizationEnabled = 1 << 16,
     kSourcePositionsEnabled = 1 << 17,
     kFirstCompile = 1 << 18,
+    kBailoutOnUninitialized = 1 << 19,
   };
 
   explicit CompilationInfo(ParseInfo* parse_info);
   CompilationInfo(const char* debug_name, Isolate* isolate, Zone* zone,
                   Code::Flags code_flags = Code::ComputeFlags(Code::STUB));
   virtual ~CompilationInfo();
 
   ParseInfo* parse_info() const { return parse_info_; }
 
   // -----------------------------------------------------------
@@ skipping 123 matching lines @@
   void MarkAsSplittingEnabled() { SetFlag(kSplittingEnabled); }
 
   bool is_splitting_enabled() const { return GetFlag(kSplittingEnabled); }
 
   void MarkAsFirstCompile() { SetFlag(kFirstCompile); }
 
   void MarkAsCompiled() { SetFlag(kFirstCompile, false); }
 
   bool is_first_compile() const { return GetFlag(kFirstCompile); }
 
+  void MarkAsBailoutOnUninitialized() { SetFlag(kBailoutOnUninitialized); }
+
+  bool is_bailout_on_uninitialized() const {
+    return GetFlag(kBailoutOnUninitialized);
+  }
+
   bool GeneratePreagedPrologue() const {
     // Generate a pre-aged prologue if we are optimizing for size, which
     // will make code flushing more aggressive. Only apply to Code::FUNCTION,
     // since StaticMarkingVisitor::IsFlushable only flushes proper functions.
     return FLAG_optimize_for_size && FLAG_age_code && !will_serialize() &&
            !is_debug() && output_code_kind() == Code::FUNCTION;
   }
 
   void EnsureFeedbackVector();
   Handle<TypeFeedbackVector> feedback_vector() const {
@@ skipping 445 matching lines @@
   size_t info_zone_start_allocation_size_;
   base::ElapsedTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_H_