[compiler] Put shared function marking behind a flag

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 482392a38c38b64f162cc24d5ea711fa1afd73d3..3941d754d4159c7939c41aad1dfd60e9f8986789 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -973,7 +973,8 @@ MaybeHandle<Code> GetLazyCode(Handle<JSFunction> function) {
     return cached_code;
   }
 
-  if (function->shared()->was_marked_for_optimization()) {
+  if (FLAG_mark_shared_functions &&
+      function->shared()->was_marked_for_optimization()) {

[Michael Starzinger, 2016/10/25 10:38:24]

nit: This should actually never happen when the flag is not set. Can we instead
just put a DCHECK(FLAG_mark_shared_functions) inside the block?

[Leszek Swirski, 2016/10/25 10:56:10]

Good point, done.

     function->shared()->set_was_marked_for_optimization(false);
 
     if (FLAG_trace_opt) {