[llvm] [SPIR-V] Implement SPV_KHR_untyped_pointers extension (PR #201233)

[Arseniy Obolenskiy via llvm-commits]

================
@@ -0,0 +1,27 @@
+; RUN: llc -verify-machineinstrs -O0 -mtriple=spirv64-unknown-unknown --spirv-ext=+SPV_INTEL_function_pointers,+SPV_KHR_untyped_pointers %s -o - | FileCheck %s
+; TODO: %if spirv-tools %{ llc -O0 -mtriple=spirv64-unknown-unknown --spirv-ext=+SPV_INTEL_function_pointers,+SPV_KHR_untyped_pointers %s -o - -filetype=obj | spirv-val %}
----------------
aobolensk wrote:

What's the issue with spirv-val here? Lack of extension support?

https://github.com/llvm/llvm-project/pull/201233