Move the handling of operator[] into the new interceptors.

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

Index: sdk/lib/_internal/compiler/implementation/ssa/bailout.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/ssa/bailout.dart	(revision 15541)
+++ sdk/lib/_internal/compiler/implementation/ssa/bailout.dart	(working copy)
@@ -146,9 +146,11 @@
     // inserted for this method. The code size price for an additional
     // type guard is much smaller than the first one that causes the
     // generation of a bailout method.
-    if (instruction is HIndex &&
-        (instruction as HIndex).isBuiltin(types) &&
-        hasTypeGuards) {
+    var temp = instruction;

[kasperl, 2012/11/30 09:23:04]

How about factoring this condition out into a separate helper method that takes
a 'var' argument? Maybe check for hasTypeGuards as the first thing because it's
a cheap check?

[ngeoffray, 2012/11/30 13:18:14]

Done.

+    if ((temp is HIndex
+         || (temp is HInvokeDynamicMethod
+             && temp.isIndexOperatorOnIndexablePrimitive(types)))
+        && hasTypeGuards) {
       HBasicBlock loopHeader = instruction.block.enclosingLoopHeader;
       if (loopHeader != null && loopHeader.parentLoopHeader != null) {
         return true;