RFR: 8255766: Fix linux+arm64 build after 8254072 [v2]

[Vladimir Kozlov]

On Mon, 2 Nov 2020 18:45:08 GMT, Bernhard Urban-Forster <burban at openjdk.org> wrote:

>> Fixing this problem:
>> 
>>  1501 | assert(StackOverflow::stack_shadow_zone_size() == (int)StackOverflow::stack_shadow_zone_size(), "must be same");
>> Verified via a linux+arm64 slowdebug build and a windows+arm64 slowdebug build.
>
> Bernhard Urban-Forster has updated the pull request incrementally with one additional commit since the last revision:
> 
>   use checked_cast utility

Updated changes passed our tier1 build and testing on aarch64.

Good.

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Marked as reviewed by kvn (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1013