RFR(S): jdk11u-dev backport 8216556: Unnecessary liveness computation with JVMTI

[Doerr, Martin]

Hi,

I'd like to backport this change to jdk11u because it's very simply and avoids some unnecessary overhead.
Applies almost cleanly (only needs manual resolution because neighboring hunk has changed: CompileTheWorld removal).

bug:
https://bugs.openjdk.java.net/browse/JDK-8216556

original change:
http://hg.openjdk.java.net/jdk/jdk/rev/91ab128a65a3

jdk11u webrev:
http://cr.openjdk.java.net/~mdoerr/8216556_JVMTI_liveness/jdk11u/webrev.00/

I only had to reapply the change around
"if (CURRENT_ENV->should_retain_local_variables() || DeoptimizeALot || CompileTheWorld) {"
(ciMethod.cpp) because CompileTheWorld was removed.

Please review.

Best regards,
Martin

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