arm_neon.h: Enable additional native aliases

[mr-c]

Fixes: #26042

[sbc100]

Is there a test for this header that we can update ?

[mr-c]

@sbc100 @tlively There is a test case in #26042 (comment) that could be added, but I've never done that for this repo before so I might take me longer than either of you

[mr-c]

@sbc100 @tlively I adapted a test for vdotq_s32 from SIMDe

[sbc100]

lgtm, but I'll leave the final review to @tlively since I'm not really familiar with this function of the test code.

[mr-c]

@tlively @sbc100 Any advice about this error from the test I added?

/root/project/test/neon/test_neon_wasm_simd.cpp:354:5: error: loop not vectorized: the optimizer was unable to perform the requested transformation; the transformation might be disabled or specified as part of an unsupported transformation ordering [-Werror,-Wpass-failed=transform-warning]
  354 | int main() {
      |     ^

https://app.circleci.com/pipelines/github/emscripten-core/emscripten/48300/workflows/ce123da9-47f2-4dc0-a2a0-27ee22720ec3/jobs/1103937

[sbc100]

No idea I'm afraid. Maybe if you add -fno-inline-functions the error would at least be more precise?

[sbc100]

Maybe we could disable the auto-vectorizer for this change, along with a TODO linked to a new LLVM bug regarding error: loop not vectorized?

[mr-c]

Maybe we could disable the auto-vectorizer for this change, along with a TODO linked to a new LLVM bug regarding error: loop not vectorized?

A good plan, but I don't know how to do that; can you help?

[mr-c]

@sbc100 I fixed the test by turning off SIMDe level function inlining for this test only.

For submitting the llvm optimization bug, the following command can be used as a reproducer:

em++ test/neon/test_neon_wasm_simd.cpp -o test_neon_wasm_simd.js -sNO_DEFAULT_TO_CXX -Wclosure -Werror -Wno-limited-postlink-optimizations -O1 -msimd128 -fno-lax-vector-conversions -Wno-c++11-narrowing -mfpu=neon -msimd128

Fails for -O1, -O2, and -O3 at pass 734 transform-warning on main:

error: loop not vectorized: the optimizer was unable to perform the requested transformation; the transformation might be disabled or specified as part of an unsupported transformation ordering [-Werror,-Wpass-failed=transform-warning]

From our side, we run the entire SIMDe test suite (with complete coverage of the NEON intrinsics) using emscripten tot at -O2, and we have no issues.