Sync'ing FSX with FSFS:
Record r1519281,1523459,1525442,1527344,1527512,1535070,1535399,1536307,
1541622,1544157,1546697,1546970,1547421,1547454,1547486,1549766,1549770,
1549907,1550228,1554619,1554622,1554800,1554978,1555133,1555135,1558224,
1560723,1561419,1561426-1561428,1561903,1565530,1568551,1569549,1571499,
1572049,1572336,1572363,1573006,1573071,1573196,1573198,1573744,1573794,
1574038,1574144,1574710,1575320,1575425,1575973,1576294,1576354,1577280,
1578176,1584114,1584604,1584615,1584706,1584710,1584879,1585516,1586277,
1586352,1589097,1589254,1589262,1589518,1590393,1592093,1593795 as being
already merged from /subversion/libsvn_fs_fs into subversion/libsvn_fs_x.

These changes have either already been duplicated manually, touched both
backends simultaneously or address FSFS legacy format support.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1595132 13f79535-47bb-0310-9956-ffa450edef68