Improve internal compiler API so that OSR code is never installed on function.

runtime/vm/precompiler.cc

 // Copyright (c) 2015, 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.
 
 #include "vm/precompiler.h"
 
 #include "vm/aot_optimizer.h"
 #include "vm/assembler.h"
 #include "vm/ast_printer.h"
 #include "vm/branch_optimizer.h"
@@ skipping 2928 matching lines @@
   graph_compiler->FinalizeStackMaps(code);
   graph_compiler->FinalizeVarDescriptors(code);
   graph_compiler->FinalizeExceptionHandlers(code);
   graph_compiler->FinalizeCatchEntryStateMap(code);
   graph_compiler->FinalizeStaticCallTargetsTable(code);
   graph_compiler->FinalizeCodeSourceMap(code);
 
   if (optimized()) {
     // Installs code while at safepoint.
     ASSERT(thread()->IsMutatorThread());
-    function.InstallOptimizedCode(code, /* is_osr = */ false);
+    function.InstallOptimizedCode(code);
   } else {  // not optimized.
     function.set_unoptimized_code(code);
     function.AttachCode(code);
   }
   ASSERT(!parsed_function()->HasDeferredPrefixes());
   ASSERT(FLAG_load_deferred_eagerly);
 }
 
 
 // Return false if bailed out.
@@ skipping 605 matching lines @@
 
   ASSERT(FLAG_precompiled_mode);
   const bool optimized = function.IsOptimizable();  // False for natives.
   DartPrecompilationPipeline pipeline(zone, field_type_map);
   return PrecompileFunctionHelper(precompiler, &pipeline, function, optimized);
 }
 
 #endif  // DART_PRECOMPILER
 
 }  // namespace dart