[llvm] [RFC][SPIR-V] Add llvm.arbitrary.fp.convert intrinsic (PR #164252)

[Matt Arsenault via llvm-commits]

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@@ -149,6 +149,7 @@ static const std::map<std::string, SPIRV::Extension::Extension, std::less<>>
         {"SPV_INTEL_tensor_float32_conversion",
          SPIRV::Extension::Extension::SPV_INTEL_tensor_float32_conversion},
         {"SPV_KHR_bfloat16", SPIRV::Extension::Extension::SPV_KHR_bfloat16},
+        {"SPV_EXT_float8", SPIRV::Extension::Extension::SPV_EXT_float8},
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arsenm wrote:

Does not belong in this patch 

https://github.com/llvm/llvm-project/pull/164252