git: openjdk/jdk: 8292679: Simplify thread creation in gtest and port 2 tests to new way

[Coleen Phillimore]

Changeset: 69448f9c
Author:    Johan Sjölén <johan.sjolen at oracle.com>
Committer: Coleen Phillimore <coleenp at openjdk.org>
Date:      2022-08-24 15:50:21 +0000
URL:       https://git.openjdk.org/jdk/commit/69448f9c1a9b123be8ef63bb039111a8976a8da6

8292679: Simplify thread creation in gtest and port 2 tests to new way

Reviewed-by: rehn, coleenp, stuefe

! test/hotspot/gtest/classfile/test_symbolTable.cpp
! test/hotspot/gtest/threadHelper.inline.hpp
! test/hotspot/gtest/utilities/test_globalCounter.cpp