[clang] [llvm] [SPIRV] Add support for the `SPV_EXT_long_vector` extension (PR #210279)

[Marcos Maronas via cfe-commits]

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+; RUN: llc -verify-machineinstrs -O0 --spirv-ext=+SPV_INTEL_masked_gather_scatter,+SPV_EXT_long_vector -mtriple=spirv64-unknown-unknown %s -o - | FileCheck %s
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maarquitos14 wrote:

Should we also check that it fails without `SPV_INTEL_masked_gather_scatter`?

https://github.com/llvm/llvm-project/pull/210279