RFR: 8296645: org.openjdk.bench.javax.tools.Javac leaves class files in current directory

[Aleksey Shipilev]

$ java -jar ../build/linux-x86_64-server-release/images/test/micro/benchmarks.jar org.openjdk.bench.javax.tools.Javac.testCompile -f 1 -r 1s -w 1s
...

$ ls
Apan.class
``` 

Additional testing:
 - [x] Eyeballing CWD and `/tmp` contents after the benchmark -- no leftovers

-------------

Commit messages:
 - Fix indenting
 - Fix

Changes: https://git.openjdk.org/jdk/pull/11055/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11055&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296645
  Stats: 24 lines in 1 file changed: 23 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11055.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11055/head:pull/11055

PR: https://git.openjdk.org/jdk/pull/11055