Remove obsolete JSFunction::IsOptimizable predicate.

src/runtime/runtime-test.cc

Index: src/runtime/runtime-test.cc
diff --git a/src/runtime/runtime-test.cc b/src/runtime/runtime-test.cc
index e5d84d11913bc2d02d05599c578a489f53cd7c1e..dfc7364c96ba34959aaadf0a7090230bddf5a36f 100644
--- a/src/runtime/runtime-test.cc
+++ b/src/runtime/runtime-test.cc
@@ -85,8 +85,7 @@ RUNTIME_FUNCTION(Runtime_OptimizeFunctionOnNextCall) {
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
   // The following assertion was lifted from the DCHECK inside
   // JSFunction::MarkForOptimization().
-  RUNTIME_ASSERT(function->shared()->allows_lazy_compilation() ||
-                 function->IsOptimizable());
+  RUNTIME_ASSERT(function->shared()->allows_lazy_compilation());
 
   // If the function is already optimized, just return.
   if (function->IsOptimized()) return isolate->heap()->undefined_value();
@@ -129,8 +128,7 @@ RUNTIME_FUNCTION(Runtime_OptimizeOsr) {
 
   // The following assertion was lifted from the DCHECK inside
   // JSFunction::MarkForOptimization().
-  RUNTIME_ASSERT(function->shared()->allows_lazy_compilation() ||
-                 function->IsOptimizable());
+  RUNTIME_ASSERT(function->shared()->allows_lazy_compilation());
 
   // If the function is already optimized, just return.
   if (function->IsOptimized()) return isolate->heap()->undefined_value();