EnumSet fix

[Andrew John Hughes]

This fixes a bug just fixed in Classpath where the complement of
an EnumSet is calculated incorrectly.  Because this works via flipping
the bits in the bitset, flipping those bits unused by the enumset
results in a incorrect output.  For example, the complement of an enumset
for a 5 element enum with 2 of the elements present, prior to this bug fix,
is an enumset with the three remaining elements (correct) plus an additional
59 entries resulting from the inversion of the entire 64 bits in the bitset.
This then leads to an IndexOutOfBoundsException on iteration.

I've attached the fix patched against GCC trunk. Okay to commit?

Thanks,
-- 
Andrew :-)

Escape the Java Trap with GNU Classpath!
http://www.gnu.org/philosophy/java-trap.html
public class gcj extends Freedom implements Java { ... }
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