RFR: 8263709: Cleanup THREAD/TRAPS/CHECK usage in JRT_ENTRY routines

[David Holmes]

All JRT_ENTRY routines are required to have a parameter, "JavaThread* thread", which must be the current thread. The JRT_ENTRY, and related macros, then use this parameter and also expose it as THREAD for use with exception macros. But the fact "thread" is the current thread is lost in some routines and we see strange calls to other code that pass both "thread" and "THREAD" as distinct parameters - primarily when a TRAPS method is involved.

This should be cleaned up along with a general check on misuse of TRAPS/THREAD. 

Testing: tiers 1-3

Thanks,
David

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Commit messages:
 - 8263709: Cleanup THREAD/TRAPS/CHECK usage in JRT_ENTRY routines

Changes: https://git.openjdk.java.net/jdk/pull/3062/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3062&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263709
  Stats: 110 lines in 6 files changed: 12 ins; 15 del; 83 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3062.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3062/head:pull/3062

PR: https://git.openjdk.java.net/jdk/pull/3062