[interpreter] Add explicit OSR polling bytecode.

src/compiler.cc

 // 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.
 
 #include "src/compiler.h"
 
 #include <algorithm>
 
 #include "src/asmjs/asm-js.h"
 #include "src/asmjs/asm-typer.h"
@@ skipping 732 matching lines @@
   return true;
 }
 
 MaybeHandle<Code> GetOptimizedCode(Handle<JSFunction> function,
                                    Compiler::ConcurrencyMode mode,
                                    BailoutId osr_ast_id = BailoutId::None(),
                                    JavaScriptFrame* osr_frame = nullptr) {
   Isolate* isolate = function->GetIsolate();
   Handle<SharedFunctionInfo> shared(function->shared(), isolate);
 
+  // TODO(4764): Remove this guard once OSR graph construction works.
+  if (!osr_ast_id.IsNone() && osr_frame->is_interpreted()) {
+    return MaybeHandle<Code>();
+  }
+
   Handle<Code> cached_code;
   if (GetCodeFromOptimizedCodeMap(function, osr_ast_id)
           .ToHandle(&cached_code)) {
     if (FLAG_trace_opt) {
       PrintF("[found optimized code for ");
       function->ShortPrint();
       if (!osr_ast_id.IsNone()) {
         PrintF(" at OSR AST id %d", osr_ast_id.ToInt());
       }
       PrintF("]\n");
@@ skipping 1126 matching lines @@
     DCHECK(shared->is_compiled());
     function->set_literals(cached.literals);
   } else if (shared->is_compiled()) {
     // TODO(mvstanton): pass pretenure flag to EnsureLiterals.
     JSFunction::EnsureLiterals(function);
   }
 }
 
 }  // namespace internal
 }  // namespace v8