6983520: java/io/pathNames/GeneralWin32.java fails with jdk7-b108 (win)

[Alan Bateman]

There are couple of stability issues on Windows arising from the move to 
the VS2010 compiler a few builds okay. One them is that File's 
getCanonicalPath and a few others methods crash the VM when the dealing 
with an invalid drive. This turns out to be regression in the new C 
runtime library with the _wgetdcwd function. We're following this up 
with Microsoft but for now, we can workaround this by verifying that the 
drive is valid. The webrev with the proposed changes is here:
  http://cr.openjdk.java.net/~alanb/6983520/webrev/

Thanks,
Alan.