RFR: 8262424: Change multiple get_java_xxx() functions in thread.cpp into one function

[Harold Seigel]

Please review this small fix to change the multiple get_java_xxx() functions in thread.cpp into a single function.

The fix was tested with Mach5 tiers 1 and 2 on Linux, Mac OS, and Windows, and tiers 3-5 on Linux x64.

Thanks, Harold

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Commit messages:
 - 8262424: Change multiple get_java_xxx() functions in thread.cpp into one function

Changes: https://git.openjdk.java.net/jdk/pull/2750/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2750&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262424
  Stats: 105 lines in 1 file changed: 15 ins; 80 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2750.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2750/head:pull/2750

PR: https://git.openjdk.java.net/jdk/pull/2750