RFR: 8292302: Windows GetLastError value overwritten by ThreadLocalStorage::thread

[Kevin Walls]

This is an MR which partially reverts JDK-8289091 such that JavaThread::threadObj() does not call Thread::current().

A JVMTI operation could call threadObj() and clear the Windows GetLastError value.

Partial, because I haven't reverted changes in JavaThread::print_on_error(), they aren't connected to the problems seen.

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Commit messages:
 - chmod
 - whitespace
 - 8292302: GetLastError value overwritten when running in debugger

Changes: https://git.openjdk.org/jdk/pull/10147/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10147&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292302
  Stats: 102 lines in 3 files changed: 98 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/10147.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10147/head:pull/10147

PR: https://git.openjdk.org/jdk/pull/10147