pipeline: persist shaders and pipelines per game and prewarm them at boot

src/graphics/shader/shaderCompiler.h

@@ -32,6 +32,7 @@ void BuildStageStaticKey(const ShaderComputeInputInfo& input_info, std::vector<u
 
 ShaderParams PrepareProgram(const HW::VertexShaderInfo& regs, const HW::Context& context,
                             const HW::UserConfig& user_config, ShaderVertexInputInfo& input_info);
+// Each stage's tess holds the VGT fields; the caller adds the layout reflected from the programs.
 std::array<ShaderParams, 3>
 PrepareTessellationPrograms(const HW::VertexShaderInfo& regs, const HW::Context& context,
                             std::array<ShaderVertexInputInfo, 3>& input_info);