Corrected setting IRBuilder debug location in HLSignatureLower::Gener… #8022
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…ateDxilComputeAndNodeCommonInputs()
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…ateDxilComputeAndNodeCommonInputs()
As a result of #7799, the HLSL entry function can now contain
dbg.valuecalls with !dbg location metadata with scopes corresponding to functions which have been inlined.The
HLSignatureLower::GenerateDxilComputeAndNodeCommonInputs()creates@dx.op.threadIdintrinsic calls, using the default dbg loc when creating anIRBuilder. When the first instruction in the entry block is one of thedbg,valuecalls, its dbg location is copied to the@dx.op.threadIdcalls. That makes the DXIL unreadable by the modern LLVM IR reader since it fails the IR module verification because of !dbg pointing to a different subprogram scope.This change sets the dbg location for IRBuilder to be the !dbg node of the first non-PHI and non-debug instruction in the block.