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

[Robbin Ehn]

On Tue, 6 Oct 2020 12:13:00 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> 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.

Thanks

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Marked as reviewed by rehn (Reviewer).

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