[turbofan] Add new JSFrameSpecialization reducer.

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index e1e4be3965c9e2c872dd04f1347b9eb28a6df592..45863f6b28d2a4537ae8579692b48f0c08963435 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -17,6 +17,7 @@ namespace internal {
 
 class AstValueFactory;
 class HydrogenCodeStub;
+class JavaScriptFrame;
 class ParseInfo;
 class ScriptData;
 
@@ -122,14 +123,15 @@ class CompilationInfo {
     kCompilingForDebugging = 1 << 7,
     kSerializing = 1 << 8,
     kContextSpecializing = 1 << 9,
-    kInliningEnabled = 1 << 10,
-    kTypingEnabled = 1 << 11,
-    kDisableFutureOptimization = 1 << 12,
-    kSplittingEnabled = 1 << 13,
-    kTypeFeedbackEnabled = 1 << 14,
-    kDeoptimizationEnabled = 1 << 15,
-    kSourcePositionsEnabled = 1 << 16,
-    kFirstCompile = 1 << 17,
+    kFrameSpecializing = 1 << 10,
+    kInliningEnabled = 1 << 11,
+    kTypingEnabled = 1 << 12,
+    kDisableFutureOptimization = 1 << 13,
+    kSplittingEnabled = 1 << 14,
+    kTypeFeedbackEnabled = 1 << 15,
+    kDeoptimizationEnabled = 1 << 16,
+    kSourcePositionsEnabled = 1 << 17,
+    kFirstCompile = 1 << 18,
   };
 
   explicit CompilationInfo(ParseInfo* parse_info);
@@ -217,6 +219,10 @@ class CompilationInfo {
 
   bool is_context_specializing() const { return GetFlag(kContextSpecializing); }
 
+  void MarkAsFrameSpecializing() { SetFlag(kFrameSpecializing); }
+
+  bool is_frame_specializing() const { return GetFlag(kFrameSpecializing); }
+
   void MarkAsTypeFeedbackEnabled() { SetFlag(kTypeFeedbackEnabled); }
 
   bool is_type_feedback_enabled() const {
@@ -388,6 +394,8 @@ class CompilationInfo {
     DCHECK(height >= 0);
     osr_expr_stack_height_ = height;
   }
+  JavaScriptFrame* osr_frame() const { return osr_frame_; }
+  void set_osr_frame(JavaScriptFrame* osr_frame) { osr_frame_ = osr_frame; }
 
 #if DEBUG
   void PrintAstForTesting();
@@ -492,6 +500,9 @@ class CompilationInfo {
 
   int osr_expr_stack_height_;
 
+  // The current OSR frame for specialization or {nullptr}.
+  JavaScriptFrame* osr_frame_ = nullptr;
+
   Type::FunctionType* function_type_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationInfo);
@@ -662,10 +673,9 @@ class Compiler : public AllStatic {
   // In the latter case, return the InOptimizationQueue builtin.  On failure,
   // return the empty handle.
   MUST_USE_RESULT static MaybeHandle<Code> GetOptimizedCode(
-      Handle<JSFunction> function,
-      Handle<Code> current_code,
-      ConcurrencyMode mode,
-      BailoutId osr_ast_id = BailoutId::None());
+      Handle<JSFunction> function, Handle<Code> current_code,
+      ConcurrencyMode mode, BailoutId osr_ast_id = BailoutId::None(),
+      JavaScriptFrame* osr_frame = nullptr);
 
   // Generate and return code from previously queued optimization job.
   // On failure, return the empty handle.