Add higher-level accesses to Environment. Print flow graph after register allocation. Most interest…

runtime/vm/intermediate_language.h

Index: runtime/vm/intermediate_language.h
===================================================================
--- runtime/vm/intermediate_language.h	(revision 9819)
+++ runtime/vm/intermediate_language.h	(working copy)
@@ -2482,14 +2482,18 @@
     return values_;
   }
 
-  GrowableArray<Location>* locations() {
-    return &locations_;
+  void AddLocation(Location value) {
+    locations_.Add(value);
   }
 
-  const GrowableArray<Location>* locations() const {
-    return &locations_;
+  Location LocationAt(intptr_t ix) const {
+    return locations_[ix];
   }
 
+  Location* LocationSlotAt(intptr_t ix) const {
+    return & locations_[ix];
+  }
+
   void PrintTo(BufferFormatter* f) const;
 
  private: