Enable preaging of code objects when --optimize-for-size.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 5d75cb46fdf9cfd8d2fbedda8c2ae29caa2dd3f2..057c46029a4b9144f482ce7602e45692afa82b9e 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -4093,6 +4093,7 @@ MaybeObject* Heap::AllocateExternalArray(int length,
 MaybeObject* Heap::CreateCode(const CodeDesc& desc,
                               Code::Flags flags,
                               Handle<Object> self_reference,
+                              int prologue_offset,
                               bool immovable,
                               bool crankshafted) {
   // Allocate ByteArray before the Code object, so that we do not risk
@@ -4144,10 +4145,18 @@ MaybeObject* Heap::CreateCode(const CodeDesc& desc,
   code->set_handler_table(empty_fixed_array(), SKIP_WRITE_BARRIER);
   code->set_gc_metadata(Smi::FromInt(0));
   code->set_ic_age(global_ic_age_);
-  code->set_prologue_offset(kPrologueOffsetNotSet);
+  code->set_prologue_offset(prologue_offset);
   if (code->kind() == Code::OPTIMIZED_FUNCTION) {
     code->set_marked_for_deoptimization(false);
   }
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+  if (code->kind() == Code::FUNCTION) {
+    code->set_has_debug_break_slots(
+        isolate_->debugger()->IsDebuggerActive());
+  }
+#endif
+
   // Allow self references to created code object by patching the handle to
   // point to the newly allocated Code object.
   if (!self_reference.is_null()) {