Invalid Integer & Long literals compile when they shouldn't

2147483648I should be an invalid Integer literal.
9223372036854775808L should be an invalid Long literal.

Both currently compile (and produce an unexpected value – well, it would be the expected value in 2's complement math)

I created some unit tests to show the problem – not sure if I put them in the right place, but they do fail as I expect them to.

The Github PR is here:
https://github.com/groovy/groovy-core/pull/657

The build output is here:
http://ci.groovy-lang.org/viewLog.html?buildId=16410&buildTypeId=Groovy_Jdk7Build