[clang] [llvm] [HLSL][DXIL] Implement WaveGetLaneIndex Intrinsic (PR #111576)

[Greg Roth via cfe-commits]

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+// RUN: %clang_cc1 -finclude-default-header -triple dxil-pc-shadermodel6.6-library %s -fnative-half-type -emit-llvm-only -disable-llvm-passes -verify -verify-ignore-unexpected
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pow2clk wrote:

Are you getting unexpected diagnostics? If so, I'd like to understand them. If not, I don't think `-verify-ignore-unexpected` is needed. If anything, we should limit it to the type of diagnostic that is being produced e.g. `-verify-ignore-unexpected=note`

https://github.com/llvm/llvm-project/pull/111576