[llvm] [llvm][SPIRV] Expose fast `popcnt` support for SPIR-V targets (PR #109845)

[Vyacheslav Levytskyy via llvm-commits]

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+; RUN: opt -O3 -mtriple=spirv32-- %s -o - | llc -O3 -mtriple=spirv32-- -o - | FileCheck %s
+; RUN: %if spirv-tools %{ opt -O3 -mtriple=spirv32-- %s -o - | llc -O3 -mtriple=spirv32-- -o - -filetype=obj | spirv-val %}
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VyacheslavLevytskyy wrote:

As a nit, it'd be useful to run this as `llc -verify-machineinstrs ...`.

https://github.com/llvm/llvm-project/pull/109845