RFR: 8253717: Relocate stack overflow code out of thread.hpp/cpp [v6]

[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:

  Revised comment

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/522/files
  - new: https://git.openjdk.java.net/jdk/pull/522/files/3191748b..6e3d070b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=522&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=522&range=04-05

  Stats: 14 lines in 3 files changed: 7 ins; 3 del; 4 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