[clang] [HLSL] Fix call convention mismatch for ctor/dtor (PR #118651)

[Nathan Gauër via cfe-commits]

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+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library -x hlsl -emit-llvm -O3 -o - %s | FileCheck %s --check-prefixes=CHECK,CHECK-DXIL
+// RUN: %clang_cc1 -triple spirv-vulkan-compute -x hlsl -emit-llvm -O3 -o - %s | FileCheck %s --check-prefixes=CHECK,CHECK-SPIRV
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Keenuts wrote:

There is the `RWBuffer-constructor.hlsl` test that tests almost the same code, but without any optimization passes. Or do you mean another kind of test?

https://github.com/llvm/llvm-project/pull/118651