[llvm] [SPIRV] Emitting DebugSource, DebugCompileUnit (PR #97558)

[Vyacheslav Levytskyy via llvm-commits]

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@@ -199,6 +199,7 @@ void SPIRVPassConfig::addPreLegalizeMachineIR() {
 bool SPIRVPassConfig::addLegalizeMachineIR() {
   addPass(new Legalizer());
   addPass(createSPIRVPostLegalizerPass());
+  addPass(createSPIRVEmitNonSemanticDIPass(&getTM<SPIRVTargetMachine>()));
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VyacheslavLevytskyy wrote:

@bwlodarcz In prior discussions you've mentioned that the pass should be placed closer to the end of Backend's passes sequence. In this case you insert it between Post-Legalizer and Instruction Selection. I wonder if you intentionally is going to emit Debug Info before the Instruction Selection step, just in case.
@michalpaszkowski May I also ask your opinion about the proper place of this pass?

https://github.com/llvm/llvm-project/pull/97558