Allow using native JS []= on typed data lists.

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

Index: sdk/lib/_internal/compiler/implementation/ssa/nodes.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ssa/nodes.dart b/sdk/lib/_internal/compiler/implementation/ssa/nodes.dart
index 91fba41c95751f17442f62afe22ed3db3fc389f0..5ad05301029989ad3bdd32d77613bf92d55d4ec5 100644
--- a/sdk/lib/_internal/compiler/implementation/ssa/nodes.dart
+++ b/sdk/lib/_internal/compiler/implementation/ssa/nodes.dart
@@ -892,12 +892,19 @@ abstract class HInstruction implements Spannable {
   bool isNumber() => instructionType.isNumber();
   bool isNumberOrNull() => instructionType.isNumberOrNull();
   bool isString() => instructionType.isString();
-  bool isIndexablePrimitive() => instructionType.isIndexablePrimitive();
   bool isPrimitive() => instructionType.isPrimitive();
   bool canBeNull() => instructionType.canBeNull();
   bool canBePrimitive(Compiler compiler) =>
       instructionType.canBePrimitive(compiler);
 
+  bool isIndexable(Compiler compiler) =>
+      instructionType.isIndexable(compiler);
+  bool isMutableIndexable(Compiler compiler) =>
+      instructionType.isMutableIndexable(compiler);
+
+  // TODO(kasperl): Get rid of this one.
+  bool isIndexablePrimitive() => instructionType.isIndexablePrimitive();
+
   /**
    * Type of the unstruction.
    */