Make floating-point atomics work on the LLVM back-end path

[michel2323]

On discrete GPUs (tested on an Arc A750, NEO 26.18), oneAPI.atomic_add!/atomic_sub! on Float32 fail with 4 errors in device/intrinsics: the atomic intrinsics fall back to an unsupported runtime call (unsupported call to an unknown function (call to gpu_malloc)). Two changes fix this:

• pin SPIRVIntrinsics to the atomic-float-ops revision, whose atomic intrinsics lower properly (pinned by commit SHA so the resolution is reproducible);
• declare SPV_EXT_shader_atomic_float_add (plus the relaxed-printf extension) for the LLVM SPIR-V back-end — extensions must be declared to permit the corresponding instructions during translation, and without the declaration the atomic float instructions fail with LLVM ERROR: The atomic float instruction requires the following SPIR-V extension: SPV_EXT_shader_atomic_float_add.

Also relaxes the onemkl version test to accept oneMKL 2025.2+, so the suite works against a locally built support library (and the Aurora LTS toolchain, where this originates).

With this, device/intrinsics passes 116/116 and onemkl 1048 + 48 broken on the A750. Extracted from the aurora-lts branch so it can land on main independently.

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diff --git a/test/onemkl.jl b/test/onemkl.jl
index 4a4c7fc..518c179 100644
--- a/test/onemkl.jl
+++ b/test/onemkl.jl
@@ -14,7 +14,7 @@ k = 13
 
 @testset "Version" begin
     version_onemkl = oneMKL.version()
-    @test version_onemkl ≥ v"2025.2.0"
+        @test version_onemkl ≥ v"2025.2.0"
 end
 
 ############################################################################################

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.06%. Comparing base (05292cb) to head (9ae172f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #595   +/-   ##
=======================================
  Coverage   79.06%   79.06%           
=======================================
  Files          50       50           
  Lines        3362     3362           
=======================================
  Hits         2658     2658           
  Misses        704      704           

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