[libclc] [libclc] Remove clspv-specific clc conversions (PR #128500)

[Romaric Jodin via cfe-commits]

rjodinchr wrote:

This commit is causing regressions on the OpenCL-CTS with `clvk/clspv`. I need more time to understand what the issue is exactly.

https://github.com/llvm/llvm-project/pull/128500