Remove obsolete JSFunction::IsOptimizable predicate.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 90985eea7dfb4c3c6defb83c14a75541f1582b14..129ba3f64ed0b91e4276e4f770a1e0c6e7ad8971 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -9804,7 +9804,8 @@ void JSFunction::JSFunctionIterateBody(int object_size, ObjectVisitor* v) {
 void JSFunction::MarkForOptimization() {
   Isolate* isolate = GetIsolate();
   DCHECK(!IsOptimized());
-  DCHECK(shared()->allows_lazy_compilation() || IsOptimizable());
+  DCHECK(shared()->allows_lazy_compilation() ||
+         !shared()->optimization_disabled());
   set_code_no_write_barrier(
       isolate->builtins()->builtin(Builtins::kCompileOptimized));
   // No write barrier required, since the builtin is part of the root set.
@@ -9828,7 +9829,8 @@ void JSFunction::AttemptConcurrentOptimization() {
   }
   DCHECK(!IsInOptimizationQueue());
   DCHECK(!IsOptimized());
-  DCHECK(shared()->allows_lazy_compilation() || IsOptimizable());
+  DCHECK(shared()->allows_lazy_compilation() ||
+         !shared()->optimization_disabled());
   DCHECK(isolate->concurrent_recompilation_enabled());
   if (FLAG_trace_concurrent_recompilation) {
     PrintF("  ** Marking ");
@@ -9836,7 +9838,7 @@ void JSFunction::AttemptConcurrentOptimization() {
     PrintF(" for concurrent recompilation.\n");
   }
   set_code_no_write_barrier(
-      GetIsolate()->builtins()->builtin(Builtins::kCompileOptimizedConcurrent));
+      isolate->builtins()->builtin(Builtins::kCompileOptimizedConcurrent));
   // No write barrier required, since the builtin is part of the root set.
 }