RFR: 8287785: Reduce runtime of java.lang.invoke microbenchmarks [v2]

[Claes Redestad]

> - Add explicit run configurations to java.lang.invoke micros, aiming to reduce runtime while maintaining a decently high confidence that there's enough warmup to produce good enough data.
> 
> - Remove several trivial baseline micros, mainly those that only return a static object: It's reasonable to have baseline microbenchmarks when the baseline op is complex and you're mostly interested in checking the overhead of doing the same thing via some MH API, but blackhole operations are now shortcutting very quickly and timings doesn't differ from one type of object to another, so we don't need a multitude of such baseline tests.
> 
> Estimated runtime of `make test TEST=micro:java.lang.micro` (excluding build) drops from just above 28 to just above 3 hours.

Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:

  Remove unused cached field in LookupAcquire

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/9012/files
  - new: https://git.openjdk.java.net/jdk/pull/9012/files/f351ac70..0a1f7ec7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=9012&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=9012&range=00-01

  Stats: 11 lines in 1 file changed: 0 ins; 11 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/9012.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/9012/head:pull/9012

PR: https://git.openjdk.java.net/jdk/pull/9012