[svn r330] Implemented synchronized statements. Changed the tryfinally handlers to a more generalized EnclosingHandler. Changed ClassInfoS to be mutable so they can be used as locks. Added new BB after throw ala return/break etc.

module nested3;

void main()
{
    int i;
    void test()
    {
        i = 3;
    }
    test();
    assert(i == 3);
}