RFR: 8353217: Build libsleef on macos-aarch64

[Magnus Ihse Bursie]

On Sat, 29 Mar 2025 00:58:59 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> Build and use SLEEF library as a backend implementation for Vector API trigonometric functions on macosx-aarch64 platform.
> 
> It improves raw throughput and eliminates GC overhead of non-intrinsified Vector API operation.
> 
> PR includes build changes and libsleef sources relocation from `src/jdk.incubator.vector/linux/native/` to `src/jdk.incubator.vector/share/native/`.
> 
> Once libsleef library is present, existing code in `stubGenerator_aarch64.cpp` successfully links at JVM startup. 
> 
> Testing: hs-tier1 - hs-tier4, microbenchmarks

Instead of trying to guide you how to fix this, I made the unification of all libsleef stanzas myself. It is available here:

https://github.com/openjdk/jdk/commit/04feadda561b2f7a6afff440ab5b4e188361c048

That commit assumes that `vector_math_sve.c`  should have `$(SVE_CFLAGS)` on mac as well as on linux. If that is not correct, then it needs to be adjusted.

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PR Comment: https://git.openjdk.org/jdk/pull/24306#issuecomment-2766072866