Revert of Remove obsolete JSFunction::IsOptimizable predicate.

src/runtime-profiler.cc

Index: src/runtime-profiler.cc
diff --git a/src/runtime-profiler.cc b/src/runtime-profiler.cc
index 838888aeb1dca635d7903abcfae57d13980e199c..22567d3b90576be19f829e6a55ea33c5b4d68e53 100644
--- a/src/runtime-profiler.cc
+++ b/src/runtime-profiler.cc
@@ -88,6 +88,8 @@
 
 
 void RuntimeProfiler::Optimize(JSFunction* function, const char* reason) {
+  DCHECK(function->IsOptimizable());
+
   if (FLAG_trace_opt && function->PassesFilter(FLAG_hydrogen_filter)) {
     PrintF("[marking ");
     function->ShortPrint();
@@ -215,7 +217,7 @@
       }
       continue;
     }
-    if (function->IsOptimized()) continue;
+    if (!function->IsOptimizable()) continue;
 
     int ticks = shared_code->profiler_ticks();