Remove H[Reverse]PostOrderIterator and HInsertionOrderIterator.

Use range-based loops instead, introducing helper functions
ReverseRange() for iteration in reverse order in containers.
When the contents of the underlying container change inside
the loop, use an index-based loop that better exposes the
container data modifications, compared to the old iterator
interface that's hiding it which may lead to subtle bugs.

Test: m test-art-host
Change-Id: I2a4e6c508b854c37a697fc4b1e8423a8c92c5ea0
diff --git a/compiler/optimizing/licm.cc b/compiler/optimizing/licm.cc
index a0ded74..eb2d18d 100644
--- a/compiler/optimizing/licm.cc
+++ b/compiler/optimizing/licm.cc
@@ -15,6 +15,7 @@
  */
 
 #include "licm.h"
+
 #include "side_effects_analysis.h"
 
 namespace art {
@@ -90,8 +91,7 @@
   }
 
   // Post order visit to visit inner loops before outer loops.
-  for (HPostOrderIterator it(*graph_); !it.Done(); it.Advance()) {
-    HBasicBlock* block = it.Current();
+  for (HBasicBlock* block : graph_->GetPostOrder()) {
     if (!block->IsLoopHeader()) {
       // Only visit the loop when we reach the header.
       continue;