…3509)

Signed-off-by: Dan Johansson <dan.johansson@arm.com>

* batched-bench : fix pp batch contents

* metal : optimize multi-sequence FA vec kernel

ggml-ci

* batched-bench : fix pp batch contents

* metal : optimize multi-sequence FA vec kernel

ggml-ci

* metal : use FA-vec kernel up to batch size 20

ggml-ci

This shader uses coopmat1 to do the Q*K^T multiply. The P*V multiply is more
difficult for various reasons so I haven't done it. Performance for this
shader is around 2.5x better than for the scalar shader when doing prompt
processing. Some of the benefit may be from other optimizations like staging
through shared memory, or splitting by rows.

This PR improves q6_k_q8_k gemm kernel with arm64 i8mm instruction.

Tested on neoverse-n2 with llama3 8b q6_k quantization model.
- 40% ~ 54% S_PP uplift for all batch sizes
- 16% ~ 47% S_TG uplift for batch size 4 and above

Perplexity doesn't change with this PR.

```
// tested on neoverse-n2
$ llama-batched-bench \
      -m Meta-Llama-3-8B-Instruct-Q6_K.gguf \
      --no-mmap -fa \
      -c 8192 -b 4096 -ub 512 -npp 128 -ntg 128 \
      -npl 1,2,4,8,16,32 \
      -t 64

---------------------------------------------------------------------
|    PP |     TG |    B |       S_PP t/s      |       S_TG t/s      |
|       |        |      | original |  this pr | original |  this pr |
|-------|--------|------|----------|----------|----------|----------|
|   128 |    128 |    1 |    78.52 |   109.18 |    18.63 |    18.88 |
|   128 |    128 |    2 |    84.62 |   123.94 |    34.54 |    36.92 |
|   128 |    128 |    4 |    84.36 |   122.49 |    52.65 |    61.32 |
|   128 |    128 |    8 |    90.52 |   138.87 |    63.46 |    84.41 |
|   128 |    128 |   16 |    90.11 |   138.56 |    71.04 |   101.33 |
|   128 |    128 |   32 |    89.81 |   137.79 |    75.14 |   110.47 |
---------------------------------------------------------------------
```

* gguf : use ggml log system

* llama : remove unnecessary new lines in exception messages

ggml-ci

* vulkan: move common FA code to flash_attn_base.comp

* vulkan: move common FA index/stride setup code to flash_attn_base.comp

* build fix

* fix: use the current build config for `vulkan-shaders-gen`

* fix: only pass a valid build type to `--config`

Signed-off-by: noemotiovon <757486878@qq.com>

ggml-ci

ggml-ci