Flush code faster when doing emergency GCs.

src/heap/mark-compact.cc

Index: src/heap/mark-compact.cc
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index f7899c960440932a1a6c3c931755632a1bd7e497..502e618b449a6932e05db71981f8dfc8b9d4218b 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -1349,8 +1349,13 @@ class MarkCompactMarkingVisitor
     if (re->TypeTag() != JSRegExp::IRREGEXP) return;
 
     Object* code = re->DataAt(JSRegExp::code_index(is_one_byte));
-    if (!code->IsSmi() &&
-        HeapObject::cast(code)->map()->instance_type() == CODE_TYPE) {
+    if (heap->flush_eagerly()) {
+      re->SetDataAt(JSRegExp::code_index(is_one_byte),
+                    Smi::FromInt(JSRegExp::kUninitializedValue));
+      re->SetDataAt(JSRegExp::saved_code_index(is_one_byte),
+                    Smi::FromInt(JSRegExp::kUninitializedValue));
+    } else if (!code->IsSmi() &&
+               HeapObject::cast(code)->map()->instance_type() == CODE_TYPE) {
       // Save a copy that can be reinstated if we need the code again.
       re->SetDataAt(JSRegExp::saved_code_index(is_one_byte), code);