[llvm] [SPIR-V]: Fix creation of constants of array types in SPIRV Backend (PR #96514)

[Michal Paszkowski via llvm-commits]

michalpaszkowski wrote:

For unknown reason (to me), the previously (and still currently) passing OpenCL CTS test relationals/shuffle_array_cast has significantly shorter run time after this PR (~50% difference).

https://github.com/llvm/llvm-project/pull/96514