dart2js cps: Add a pass for eliminating bounds checks.

tests/language/language_dart2js.status

Index: tests/language/language_dart2js.status
diff --git a/tests/language/language_dart2js.status b/tests/language/language_dart2js.status
index 464943bd418077e092c7b7001bc36af8617ed5ab..a0c0638e0aba890d74c1819d0e70db5a39d2a30e 100644
--- a/tests/language/language_dart2js.status
+++ b/tests/language/language_dart2js.status
@@ -234,6 +234,7 @@ many_method_calls_test: Crash # Stack overflow in HGraphVisitor.visitPostDominat
 issue23244_test: RuntimeError # 23244
 
 [ $compiler == dart2js && $cps_ir ]
+assert_assignable_type_test: Crash # Internal Error: Pending statics.
 async_await_syntax_test/a03a: Crash # (a03a()async*{}): cannot handle sync*/async* functions
 async_await_syntax_test/a03b: Crash # (a03b()async*{}): cannot handle sync*/async* functions
 async_await_syntax_test/a06a: Crash # (await for(var o in st){}): await for