[cp-patches] A bugfix and an optimization for GregorianCalendar

[Ivan Maidanski]

Hi!

This patch does the following:
- fixes a bug in getActualMaximum(WEEK_OF_YEAR) (a missing return is added at 
the end of the case);
- replaces floating point arithmetic with an integer one (when computing the 
difference between Gregorian and Julian calendars).

Changelog entries:
        * java/util/GregorianCalendar.java:
        (gregOffsetFor(int)): New private static method (integer arithmetic
        is used instead of a FP one).
        (isGregorian(int, int)): Use gregOffsetFor().
        (computeTime()): Likewise.
        (getLinearDay(int, int, boolean)): Likewise.
        (hashCode()): Optimize the expression.
        (getActualMaximum(int)): Fix a bug for WEEK_OF_YEAR case (a missing
        return is added replacing a case branch fall-through).

Regards.

classpath-ivmai-20.diff
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