RFR: 8254072: AArch64: Get rid of --disable-warnings-as-errors on Windows+ARM64 build [v4]

[Bernhard Urban-Forster]

On Mon, 2 Nov 2020 15:41:06 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Thank you Andrew.
>
> @lewurm 
> This patch seems to break on linux-aarch64 with gcc:
> open/src/hotspot/cpu/aarch64/sharedRuntime_aarch64.cpp:1501:52: error: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Werror=sign-compare]
>  1501 |     assert(StackOverflow::stack_shadow_zone_size() == (int)StackOverflow::stack_shadow_zone_size(), "must be same");
>       |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Did you test building this on any aarch64 platforms besides Windows?

@magicus I did test the initial version of this PR on linux+arm64, but not the latest iteration. sorry about that 🙁 

What is the policy here? Submit a revert right away or investigate a fix?

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PR: https://git.openjdk.java.net/jdk/pull/530