[clang] [HLSL][SPIRV] Add convergence tokens to entry point wrapper (PR #112757)

[Farzon Lotfi via cfe-commits]

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+// RUN: %clang_cc1 -triple spirv-pc-vulkan-compute -finclude-default-header -fnative-half-type -disable-llvm-passes -emit-llvm -o - %s | FileCheck %s
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farzonl wrote:

This test doesn't do anything with `native half types why do you need the `-fnative-half-type` flag?

https://github.com/llvm/llvm-project/pull/112757