8205999: C2 compilation fails with "assert(store->find_edge(load) != -1) failed: missing precedence edge"

Backout 8204157 to state before 8192992

Reviewed-by: thartmann, mdoerr

src/hotspot/share/opto/gcm.cpp

@@ -683,7 +683,7 @@ Block* PhaseCFG::insert_anti_dependences(Block* LCA, Node* load, bool verify) {
     Block* store_block = get_block_for_node(store);
     assert(store_block != NULL, "unused killing projections skipped above");
 
-    if (store->is_Phi() && store->in(0)->is_Loop()) {
+    if (store->is_Phi()) {
       // Loop-phis need to raise load before input. (Other phis are treated
       // as store below.)
       //