RFR: 7038105 - File.isHidden() should return true for pagefile.sys and hiberfil.sys

[Rob McKenna]

Hi folks,

Looking for a review of this suggested fix from Fujitsu. 
GetFileAttributesExW() returns ERROR_SHARING_VIOLATION for pagefile.sys 
and hiberfi.sys so we're falling back to FindFirstFile instead:

http://cr.openjdk.java.net/~robm/7038105/webrev.01/

     -Rob