b9368

vulkan: Switch MUL_MAT_VEC to 4 K per iteration for F16/32 (#22887)

• vulkan: Switch MUL_MAT_VEC to 4 K per iteration for F16/32

Against mesa git, this shows a 4.8% performance improvement for
tg128 on Qwen3.5-9B:BF16 on Intel BMG.

Note that this breaks some tests until the last commit which fixes
OOB A reads.

• vulkan: Use aligned loads in mul_mat_vec when available

Against mesa git, this shows a 3.3% performance improvement for
tg128 on Qwen3.5-9B:BF16 on Intel BMG.

• Make explicit that num_rows is <= NUM_ROWS in mul_mat_vec

Mesa's UUB logic can't see through conditionals, limiting its
ability to understand the bounds on the num_rows field in the
cleanup run. Making it explicit that num_rows is, indeed, always
<= NUM_ROWS helps mesa make slightly better codegen.

Against mesa git, this currently shows a 1% performance improvement
in tg128 on Qwen3.5-9B:BF16 on Intel BMG.

• vulkan: Fix OOB A reads in MUL_MAT_VEC for odd sizes

There was a TODO to fix the OOB reads from the A matrix which we do
here.

It is within performance noise (+<0.1%) in tg128 for
Qwen3.5-9B:BF16 on Intel BMG.

macOS/iOS:

• macOS Apple Silicon (arm64)
• macOS Apple Silicon (arm64, KleidiAI enabled) DISABLED
• macOS Intel (x64)
• iOS XCFramework

Linux:

• Ubuntu x64 (CPU)
• Ubuntu arm64 (CPU)
• Ubuntu s390x (CPU)
• Ubuntu x64 (Vulkan)
• Ubuntu arm64 (Vulkan)
• Ubuntu x64 (ROCm 7.2)
• Ubuntu x64 (OpenVINO)
• Ubuntu x64 (SYCL FP32) DISABLED

Android:

• Android arm64 (CPU)

Windows:

• Windows x64 (CPU)
• Windows arm64 (CPU)
• Windows x64 (CUDA 12) - CUDA 12.4 DLLs
• Windows x64 (CUDA 13) - CUDA 13.3 DLLs
• Windows x64 (Vulkan)
• Windows x64 (SYCL) DISABLED
• Windows x64 (HIP)

openEuler:

• DISABLED
• openEuler x86 (310p)
• openEuler x86 (910b, ACL Graph)
• openEuler aarch64 (310p)
• openEuler aarch64 (910b, ACL Graph)

UI:

• UI