Try to map `spirv-val` output to Rust code

I just got an error that looks like this:

error: error:0:0 - OpInBoundsAccessChain result type (OpTypeStruct) does not match the type that results from indexing into the base <id> (OpTypeArray).
         %2764 = OpInBoundsAccessChain %_ptr_Function__struct_33 %2763 %uint_0
  |
  = note: spirv-val failed
  = note: module `.../spirv-unknown-vulkan1.2/debug/deps/....spv`

Unfortunately, the output isn't all that helpful, don't know how to debug it except commenting-out pieces of code until the error goes away. However, I do have a suspicion that _ptr_Function__struct_33 might be something that codegen controls, which in turn might mean ability to translate it back to something like the name of the data structure or file and line of code.

Also maybe debug builds could use something more descriptive than struct_33 to help with debugging, like a mangling scheme.

I'm compiling with these options:

let backend = cargo_gpu::Install::from_shader_crate(shader_crate.clone()).run()?;

let spirv_builder = backend
    .to_spirv_builder(shader_crate, "spirv-unknown-vulkan1.2")
    .print_metadata(MetadataPrintout::DependencyOnly)
    .spirv_metadata(SpirvMetadata::NameVariables)
    .release(false);

cargo_gpu::Install のフローと to_spirv_builder(...).spirv_metadata(SpirvMetadata::NameVariables) の設定を確認し、続いて出力された spirv-val の診断で _ptr_Function__struct_33 がどのように示されるかを調査します。具体的なマッピングまたは命名の動作を定義し、示されている OpInBoundsAccessChain の失敗に対して検証します。生成された診断で関連する Rust のソースコンテキストを特定できるか、より説明的なデバッグ名を提供できれば、issue は完了です。