RFR: 8272836: Optimize run time for java/lang/invoke/LFCaching tests

[Aleksey Shipilev]

See the RFE for discussion.

Current PR improves the test time like this:


$  make run-test TEST=java/lang/invoke/LFCaching/

# Before
real	3m51.608s
user	5m21.612s
sys	0m5.391s

# After
real	1m13.606s
user	2m26.827s
sys	0m4.761s

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

Commit messages:
 - 8272836: Optimize run time for java/lang/invoke/LFCaching tests

Changes: https://git.openjdk.java.net/jdk/pull/5214/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5214&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272836
  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5214.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5214/head:pull/5214

PR: https://git.openjdk.java.net/jdk/pull/5214