Summary: Replace JVM_* functions with direct system calls in java io area
Reviewed-by: alanb, uta, martin

Reviewed-by: chegar, ksrini

7130915: File.equals does not give expected results when path contains Non-English characters on Mac OS X
Summary: to support Unicode nfd/nfc file path on Macos
Reviewed-by: alanb

Reviewed-by: xdono

6709457: (fc) lock/tryLock() throws IOException "Access is denied" when file opened for append [win]
Reviewed-by: chegar

Reviewed-by: darcy, weijun