[llvm] [SPIR-V] Require SPV_EXT_long_vector for non-standard vector widths (PR #212685)

[Juan Manuel Martinez Caamaño via llvm-commits]

https://github.com/jmmartinez commented:

Wouldn't it be better to wait for https://github.com/llvm/llvm-project/pull/210279 ?

https://github.com/llvm/llvm-project/pull/212685