RFR(S): 8147078: MethodHandles.catchException does not enforce Throwable subtype

[Michael Haupt]

Dear all,

please review this fix.
Bug: https://bugs.openjdk.java.net/browse/JDK-8147078
Webrev: http://cr.openjdk.java.net/~mhaupt/8147078/webrev.00

Unlike MethodHandles.throwException, MethodHandles.catchException does not enforce that the passed exception type is indeed a subtype of Throwable. The change adds the corresponding check, and a test.

Thanks,

Michael

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