disable D_TYPE same as A_TYPE cast for rope shaders

[futz12]

revert: #16872

fix: #16860

This fix simply disables the optimization for the corresponding shader to address this issue. For glslc versions without this bug, it is unnecessary to turn off the optimization. I added a new macro to check if the data types are the same to avoid casting, rather than disabling optimization, ensuring that performance is not affected.

cannot compile rope_norm_f16

/bin/glslc -fshader-stage=compute --target-env=vulkan1.2 -O /home/cix/llama.cpp/ggml/src/ggml-vulkan/vulkan-shaders/rope_norm.comp -o /home/cix/llama.cpp/build/ggml/src/ggml-vulkan/vulkan-shaders.spv/rope_norm_f16.spv -DA_TYPE=float16_t -DD_TYPE=float16_t 

shaderc: internal error: compilation succeeded but failed to optimize: Expected input to have different bit width from Result Type: FConvert
%212 = OpFConvert %half %211

During the process of compiling SPV with glslc, FConvert is used to convert variables of the same type. Shaderc considers this invalid, resulting in a compilation error.

@jeffbolznv

[jeffbolznv]

I would rather disable spirv-opt, which I don't think gains any performance at all, than add more complexity to the shaders.

[0cc4m]

Do you see a performance difference from this change?

[futz12]

You are right, enabling opt can even result in negative optimization.