RFR: JDK-8283326: Implement SafeFetch statically

[David Holmes]

On Mon, 11 Apr 2022 09:18:33 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> On Posix platforms you can use either static assembly or setjmp, and need to exclude one of them from compilation - either build safefetch_xx_xx.S, or build safefetch_sigjmp.cpp.

Yes but we don't need to make this build time selectable. If a platform supports static then it will have a .S file and won't use the sigjmp file (which will be empty due to ifdef based on platform); otherwise no .S file and the sigjmp file is populated.

I would hope all Windows platforms support SEH.

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PR: https://git.openjdk.java.net/jdk/pull/7865