Revert r16032: it revealed a bug in our bailout environment computation.

sdk/lib/_internal/compiler/implementation/ssa/tracer.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/tracer.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/ssa/tracer.dart	(revision 16033)
+++ sdk/lib/_internal/compiler/implementation/ssa/tracer.dart	(working copy)
@@ -306,12 +306,7 @@
     return "$invokeType: $functionName($argumentsString)";
   }
 
-  String visitIndex(HIndex node) {
-    String receiver = temporaryId(node.receiver);
-    String index = temporaryId(node.index);
-    return "Index: $receiver[$index]";
-  }
-
+  String visitIndex(HIndex node) => visitInvokeStatic(node);
   String visitIndexAssign(HIndexAssign node) => visitInvokeStatic(node);
 
   String visitIntegerCheck(HIntegerCheck node) {