Reapply "Initial implementation of on-stack replacement (OSR)."

runtime/vm/compiler.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_COMPILER_H_
 #define VM_COMPILER_H_
 
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
 #include "vm/runtime_entry.h"
@@ skipping 26 matching lines @@
   static RawError* CompileClass(const Class& cls);
 
   // Generates code for given function and sets its code field.
   //
   // Returns Error::null() if there is no compilation error.
   static RawError* CompileFunction(const Function& function);
 
   // Generates optimized code for function.
   //
   // Returns Error::null() if there is no compilation error.
-  static RawError* CompileOptimizedFunction(const Function& function);
+  static RawError* CompileOptimizedFunction(
+      const Function& function,
+      intptr_t osr_id = Isolate::kNoDeoptId);
 
   // Generates code for given parsed function (without parsing it again) and
   // sets its code field.
   //
   // Returns Error::null() if there is no compilation error.
   static RawError* CompileParsedFunction(ParsedFunction* parsed_function);
 
   // Generates and executes code for a given code fragment, e.g. a
   // compile time constant expression. Returns the result returned
   // by the fragment.
   //
   // The return value is either a RawInstance on success or a RawError
   // on compilation failure.
   static RawObject* ExecuteOnce(SequenceNode* fragment);
 
   // Eagerly compiles all functions in a class.
   //
   // Returns Error::null() if there is no compilation error.
   static RawError* CompileAllFunctions(const Class& cls);
 };
 
 }  // namespace dart
 
 #endif  // VM_COMPILER_H_