RFR: 8255766: Fix linux+arm64 build after 8254072

[Vladimir Kozlov]

On Mon, 2 Nov 2020 17:04:53 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.

Let me test it.

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