message: Expose BuiltInToSystemAttribute function for mapping to our own enum
diff: @@ -68,9 +68,12 @@ void ShutdownSPIRVCompiler();
  struct SPVInstruction;
  enum class ShaderStage : uint32_t;
  +enum class ShaderBuiltin : uint32_t;
  struct ShaderReflection;
  struct ShaderBindpointMapping;
  +ShaderBuiltin BuiltInToSystemAttribute(ShaderStage stage, const spv::BuiltIn el);
  +
  // extra information that goes along with a ShaderReflection that has extra information for SPIR-V
  // patching
  struct SPIRVPatchData
  