dart2js cps: Combine integer type check with bounds check.

tests/compiler/dart2js_extra/dart2js_extra.status

Index: tests/compiler/dart2js_extra/dart2js_extra.status
diff --git a/tests/compiler/dart2js_extra/dart2js_extra.status b/tests/compiler/dart2js_extra/dart2js_extra.status
index 7eeb1d344e1ea6889dd3b62d53a89546805547b2..1399e7968042402fe0ff9a86621e0560cdf4e64c 100644
--- a/tests/compiler/dart2js_extra/dart2js_extra.status
+++ b/tests/compiler/dart2js_extra/dart2js_extra.status
@@ -69,6 +69,3 @@ big_allocation_expression_test: Crash # Issue 24635
 
 [ $compiler == dart2js && $cps_ir ]
 async_stacktrace_test/asyncStar: Crash # (foo()async*{try {tr...  cannot handle sync*/async* functions
-consistent_index_error_string_test: RuntimeError # Expect.equals(at index 16: Expected <...ument (index): ...>, Found: <...ument: "a">) fails.

[asgerf, 2016/02/16 11:01:45]

It seem ioore and iae throw slightly different argument errors, and these tests
assert that the error is the one used by ioore.

-consistent_index_error_array_test: RuntimeError # Expect.equals(at index 16: Expected <...ument (index): ...>, Found: <...ument: "a">, '
-consistent_index_error_typed_list_test: RuntimeError # Expect.equals(at index 16: Expected <...ument (index): ...>, Found: <...ument: "a">, '