[turbofan] Split pure nodes in the scheduler if beneficial.

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.h"
 #include "src/bailout-reason.h"
@@ skipping 72 matching lines @@
     kDeoptimizationSupport = 1 << 11,
     kDebug = 1 << 12,
     kCompilingForDebugging = 1 << 13,
     kParseRestriction = 1 << 14,
     kSerializing = 1 << 15,
     kContextSpecializing = 1 << 16,
     kInliningEnabled = 1 << 17,
     kTypingEnabled = 1 << 18,
     kDisableFutureOptimization = 1 << 19,
     kModule = 1 << 20,
-    kToplevel = 1 << 21
+    kToplevel = 1 << 21,
+    kSplittingEnabled = 1 << 22
   };
 
   CompilationInfo(Handle<JSFunction> closure, Zone* zone);
   CompilationInfo(Handle<Script> script, Zone* zone);
   CompilationInfo(Isolate* isolate, Zone* zone);
   virtual ~CompilationInfo();
 
   Isolate* isolate() const {
     return isolate_;
   }
@@ skipping 111 matching lines @@
   bool is_inlining_enabled() const { return GetFlag(kInliningEnabled); }
 
   void MarkAsTypingEnabled() { SetFlag(kTypingEnabled); }
 
   bool is_typing_enabled() const { return GetFlag(kTypingEnabled); }
 
   void MarkAsToplevel() { SetFlag(kToplevel); }
 
   bool is_toplevel() const { return GetFlag(kToplevel); }
 
+  void MarkAsSplittingEnabled() { SetFlag(kSplittingEnabled); }
+
+  bool is_splitting_enabled() const { return GetFlag(kSplittingEnabled); }
+
   bool IsCodePreAgingActive() const {
     return FLAG_optimize_for_size && FLAG_age_code && !will_serialize() &&
            !is_debug();
   }
 
   void SetParseRestriction(ParseRestriction restriction) {
     SetFlag(kParseRestriction, restriction != NO_PARSE_RESTRICTION);
   }
 
   ParseRestriction parse_restriction() const {
@@ skipping 533 matching lines @@
   Zone zone_;
   unsigned info_zone_start_allocation_size_;
   base::ElapsedTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_