[turbofan] Implement OSR for outer loops.

src/runtime/runtime-compiler.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/v8.h"
 
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/deoptimizer.h"
 #include "src/frames.h"
@@ skipping 272 matching lines @@
     if (data->OsrPcOffset()->value() >= 0) {
       DCHECK(BailoutId(data->OsrAstId()->value()) == ast_id);
       if (FLAG_trace_osr) {
         PrintF("[OSR - Entry at AST id %d, offset %d in optimized code]\n",
                ast_id.ToInt(), data->OsrPcOffset()->value());
       }
       // TODO(titzer): this is a massive hack to make the deopt counts
       // match. Fix heuristics for reenabling optimizations!
       function->shared()->increment_deopt_count();
 
-      // TODO(titzer): Do not install code into the function.
-      function->ReplaceCode(*result);
+      if (result->is_turbofanned()) {
+        // TurboFanned OSR code cannot be installed into the function.
+        // But the function is obviously hot, so optimize it next time.
+        function->ReplaceCode(
+            isolate->builtins()->builtin(Builtins::kCompileOptimized));
+      } else {
+        // Crankshafted OSR code can be installed into the function.
+        function->ReplaceCode(*result);
+      }
       return *result;
     }
   }
 
   // Failed.
   if (FLAG_trace_osr) {
     PrintF("[OSR - Failed: ");
     function->PrintName();
     PrintF(" at AST id %d]\n", ast_id.ToInt());
   }
@@ skipping 137 matching lines @@
   DCHECK(args.smi_at(4) == SLOPPY || args.smi_at(4) == STRICT);
   StrictMode strict_mode = static_cast<StrictMode>(args.smi_at(4));
   DCHECK(args[5]->IsSmi());
   Handle<SharedFunctionInfo> outer_info(args.at<JSFunction>(2)->shared(),
                                         isolate);
   return CompileGlobalEval(isolate, args.at<String>(1), outer_info,
                            args.at<Object>(3), strict_mode, args.smi_at(5));
 }
 }
 }  // namespace v8::internal