RFR: 8275950: Use only _thread_in_vm in ~ThreadBlockInVMPreprocess() [v2]

[Patricio Chilano Mateo]

> Please review this small change. Since _thread_in_vm is already an unsafe state there is no need to use the intermediate _thread_blocked_trans state when transitioning back in ~ThreadBlockInVMPreprocess(). Tested tiers1-3 in mach5.
> 
> Thanks,
> Patricio

Patricio Chilano Mateo has updated the pull request incrementally with one additional commit since the last revision:

  remove assert in SS::block

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6120/files
  - new: https://git.openjdk.java.net/jdk/pull/6120/files/313d242b..11da08be

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6120&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6120&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6120.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6120/head:pull/6120

PR: https://git.openjdk.java.net/jdk/pull/6120