[clang] [llvm] Add cross builtins and cross HLSL function to DirectX and SPIR-V backend (PR #109180)

[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 -disable-llvm-passes -verify -verify-ignore-unexpected
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pow2clk wrote:

Is this producing or expected to produce unexpected diagnostics? I see this flag in a few other uses of this in SemaHLSL, but not so much in other Sema* test directories. Perhaps it's getting copied over needlessly? 

If there are some tricky diagnostics getting produced, it might be better to limit them by assigning tis to a specific type of diagnostic. 

https://github.com/llvm/llvm-project/pull/109180