RFR(XS): 8187124: [TESTBUG] TestInterpreterMethodEntries.java: Unable to create shared archive file

[Calvin Cheung]

bug: https://bugs.openjdk.java.net/browse/JDK-8187124

webrev: http://cr.openjdk.java.net/~ccheung/8187124/webrev.00/

As described in the bug report, the change is to add the current 
timestamp into the shared archive file name.

Ran all tests under hotspot/test/runtime/SharedArchiveFile locally on 
linux-x64. All generated *.jsa files, except for the 
SharedBaseAddress.java test which sets the shared archive filenames, 
have a timestamp in their names.

thanks,
Calvin