[llvm] [GitHub][mlir][spirv] Add missing patterns for SPIR-V in mlir (PR #66423)

[Jakub Kuderski via llvm-commits]

kuhar wrote:

I tested the first two patterns with:
```js
const minimatch = require('minimatch')

function check_pattern(file, pattern) {
    match = minimatch(file, pattern)
    console.log(file + " : " + pattern + " : " + match)
}

check_pattern('mlir/lib/Conversion/ArithToSPIRV/X/Foo.cpp', 'mlir/**/*ToSPIRV/**')
check_pattern('mlir/lib/Conversion/SPIRVToLLVM/X/Foo.cpp', 'mlir/**/SPIRVTo*/**')
```

https://github.com/llvm/llvm-project/pull/66423