RFR: 8253717: Relocate stack overflow code out of thread.hpp/cpp [v5]

[Daniel D.Daugherty]

On Wed, 7 Oct 2020 18:43:40 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> // StackOverflow handling is encapsulated in this class.  This class contains state variables
>> // for each JavaThread that are used to detect stack overflow though explicit checks or through
>> // checks in the signal handler when stack banging into guard pages causes a trap.
>> // The state variables also record whether guard pages are enabled or disabled.
>> 
>> Does this sound better?  It's more descriptive but hopefully still summarizing.
>
> Re: your comment above.  I did just move the code but some of the review comments are on the existing code.  I did end
> up adding a function initialize_stack_zone_sizes and removing the set*zone functions as a result and changed some
> comments.  And added some consts.

Re: the revised StackOverflow comment

Looks good to me.

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