RFR(XS): 8129423: Fix unlink() of LogCompilation tmp files lost in merge of 8007993 and 8060074.

[Lindenmaier, Goetz]

Hi,

I detected a small flaw introduced by a merge. This webrev fixes it:
http://cr.openjdk.java.net/~goetz/webrevs/8129423-LogComp/webrev-01/
Please review this fix.  I please need a sponsor.

With LogCompilation each compiler thread writes information to its own temp log file. During shutdown
these files are concatenated into a single log file with the specified name. The temp files should be
deleted, but we found files of jtreg test TestUnstableIfTrap.java left over in the /tmp directory. Also, a simple
run with LogCompilation leaves these files in the /tmp directory.

8007993 fixed a problem with writing these log files and moved the unlink() of the temp
files. This unlink() got lost in the merge with 8060074.

Merge: http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/674657ff61c6
8060074: http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/a0dd995271c4
8007993: http://hg.openjdk.java.net/jdk9/hs/hotspot/rev/c13eb14ebf5c

Best regards,
  Goetz.