6953483: Typo related to ReduceInitialCardMarks leaves concurrent collectors...

6953483: Typo related to ReduceInitialCardMarks leaves concurrent collectors vulnerable to heap corruption
Summary: Corrected mis-spelling of COMPILER2 in #ifdef, which could cause heap corruption in CMS due to precleaning when +ReduceInitialCardMarks. Thanks to ChenGuang Sun <suncg03@gmail.com> for bringing this typo to our attention.
Reviewed-by: tonyp, jmasa, jcoomes, kvn

src/share/vm/gc_interface/collectedHeap.cpp

@@ -65,7 +65,7 @@ CollectedHeap::CollectedHeap()
 void CollectedHeap::pre_initialize() {
   // Used for ReduceInitialCardMarks (when COMPILER2 is used);
   // otherwise remains unused.
-#ifdef COMPLER2
+#ifdef COMPILER2
   _defer_initial_card_mark =    ReduceInitialCardMarks && can_elide_tlab_store_barriers()
                              && (DeferInitialCardMark || card_mark_must_follow_store());
 #else