message: Handle a couple of other instructions for type replacements in postvs
diff: @@ -407,6 +407,19 @@ static void ConvertToMeshOutputCompute(const ShaderReflection &refl, const SPIRV
  editor.PostModify(it);
  }
  }
  + else if(it.opcode() == rdcspv::Op::Undef)
  + {
  + rdcspv::OpUndef undef(it);
  +
  + auto replIt = typeReplacements.find(undef.resultType);
  + if(replIt != typeReplacements.end())
  + {
  + editor.PreModify(it);
  + undef.resultType = replIt->second;
  + it = undef;
  + editor.PostModify(it);
  + }
  + }
  }
  for(rdcspv::Iter it = editor.Begin(rdcspv::Section::Functions); it; ++it)
  @@ -416,7 +429,8 @@ static void ConvertToMeshOutputCompute(const ShaderReflection &refl, const SPIRV
  it.opcode() == rdcspv::Op::Variable || it.opcode() == rdcspv::Op::AccessChain ||
  it.opcode() == rdcspv::Op::InBoundsAccessChain || it.opcode() == rdcspv::Op::Bitcast ||
  it.opcode() == rdcspv::Op::Undef || it.opcode() == rdcspv::Op::ExtInst ||
  - it.opcode() == rdcspv::Op::FunctionCall || it.opcode() == rdcspv::Op::Phi)
  + it.opcode() == rdcspv::Op::FunctionCall || it.opcode() == rdcspv::Op::Phi ||
  + it.opcode() == rdcspv::Op::Select)
  {
  editor.PreModify(it);
  