[llvm] [SPIRV] Avoid OpQuantizeToF16 in SPIR-V kernel test (PR #158086)

[Marcos Maronas via llvm-commits]

https://github.com/maarquitos14 approved this pull request.

LGTM. Can we spin off the OpQuantizeToF16 test to a new test and mark as xfail/unsupported, so we don't reduce test coverage?

https://github.com/llvm/llvm-project/pull/158086