dart2js cps: Refactor CallExpressions into Primitives.

pkg/compiler/lib/src/cps_ir/redundant_phi.dart

Index: pkg/compiler/lib/src/cps_ir/redundant_phi.dart
diff --git a/pkg/compiler/lib/src/cps_ir/redundant_phi.dart b/pkg/compiler/lib/src/cps_ir/redundant_phi.dart
index 183f8e36ff2e6fe9815e65b94389b4d851a62ccc..7f16af9cfea5f60f626c48cf7d0cb55ce02eda1c 100644
--- a/pkg/compiler/lib/src/cps_ir/redundant_phi.dart
+++ b/pkg/compiler/lib/src/cps_ir/redundant_phi.dart
@@ -138,7 +138,7 @@ class RedundantPhiEliminator extends TrampolineRecursiveVisitor implements Pass
       // * and implicitly remove param from continuation signature and
       //   invocations by not incrementing `dst`. References of removed
       //   arguments are unlinked to keep definition usages up to date.
-      uniqueDefinition.substituteFor(oldDefinition);
+      oldDefinition.replaceUsesWith(uniqueDefinition);
       for (InvokeContinuation invoke in invokes) {
         invoke.arguments[src].unlink();
       }
@@ -191,7 +191,7 @@ void _moveIntoScopeOf(LetCont letCont, Definition definition) {
 
 /// Ensures [continuation] has its own LetCont binding by creating
 /// a new LetCont below its current binding, if necessary.
-/// 
+///
 /// Returns the LetCont that now binds [continuation].
 LetCont _makeUniqueBinding(Continuation continuation) {
   LetCont letCont = continuation.parent;