RFR: JDK-8303549: [AIX] TestNativeStack.java is failing with exit value 1 [v6]

[Varada M]

> Stackoverflow exception has caused an exit value 1 when native thread is attaching as daemon. 
> On AIX the default stack for posix thread is 192 KB. For this particular test we run thread in pthread_create() which is defined in pthread library thus not following JVM thread creation routines. Hence we have to explicitly provide stack size. 
> 
> Reported Issue :[JDK-8303549]( https://bugs.openjdk.org/browse/JDK-8303549)

Varada M has updated the pull request incrementally with one additional commit since the last revision:

  pthread attributes

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/14209/files
  - new: https://git.openjdk.org/jdk/pull/14209/files/d5d3487b..677d53c1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14209&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14209&range=04-05

  Stats: 8 lines in 1 file changed: 4 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14209.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14209/head:pull/14209

PR: https://git.openjdk.org/jdk/pull/14209