dart2js cps: Add a pass for eliminating bounds checks.

tests/corelib/corelib.status

Index: tests/corelib/corelib.status
diff --git a/tests/corelib/corelib.status b/tests/corelib/corelib.status
index 56f3f170e1f871eeecbd4ba57786e6d7542182ad..e5e5573b458ed4fc91d8b6dd6bfcc0cbeda4b8a0 100644
--- a/tests/corelib/corelib.status
+++ b/tests/corelib/corelib.status
@@ -231,6 +231,7 @@ map_values2_test: RuntimeError # Please triage this failure.
 map_values3_test: RuntimeError # Please triage this failure.
 map_values4_test: RuntimeError # Please triage this failure.
 package_resource_test: Crash # (await for(var byteSlice in resource.openRead()){streamBytes.addAll(byteSlice);}): await for
+regexp/pcre_test: Crash # Stack Overflow in LoopHierarchy.

[asgerf, 2015/09/16 15:25:09]

This is a bug in LoopHierarchy. I expected there wouldn't be deeply nested join
continuations, but that doesn't hold up. I will make it use the trampoline.

[sra1, 2015/09/30 21:54:20]

Acknowledged.

 symbol_operator_test/03: RuntimeError # Please triage this failure.
 symbol_reserved_word_test/03: Pass # Please triage this failure.
 symbol_reserved_word_test/06: RuntimeError # Please triage this failure.