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