RFR: 8253717: Relocate stack overflow code out of thread.hpp/cpp [v2]

[Coleen Phillimore]

> This change moves the significant amount of stack overflow related code (with ascii art!) out of thread files into a
> new file.  Many of the functions are static functions and some go through JavaThread::_stack_overflow_state where
> needed.   All functions are moved and not modified except for qualification.  I also added a delegating constructor to
> JavaThread::JavaThread so reordered the assignments as initializers from JavaThread::initialize.
> Tested with tier1-6 and builds on arm32, ppc, s390 and zero.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  8253717: Relocate stack overflow code out of thread.hpp/cpp

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/522/files
  - new: https://git.openjdk.java.net/jdk/pull/522/files/9905e355..75ddb562

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=522&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=522&range=00-01

  Stats: 7 lines in 4 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/522.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/522/head:pull/522

PR: https://git.openjdk.java.net/jdk/pull/522