Generalize builtins inlining flag to allow forced inlining of any function

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 86bf7634296dcbf71b8a2debf27262464a1a1e3c..5bf9f7b0d154f66c9e924695dc3c5dd2f1df0987 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -7951,9 +7951,12 @@ int HOptimizedGraphBuilder::InliningAstSize(Handle<JSFunction> target) {
   Handle<JSFunction> caller = current_info()->closure();
   Handle<SharedFunctionInfo> target_shared(target->shared());
 
-  // Always inline builtins marked for inlining.
+  // Always inline functions that force inlining.
+  if (target_shared->force_inline()) {
+    return 0;
+  }
   if (target->IsBuiltin()) {
-    return target_shared->inline_builtin() ? 0 : kNotInlinable;
+    return kNotInlinable;
   }
 
   if (target_shared->IsApiFunction()) {