Optimize SpiriV output

src/video_core/renderer_opengl/gl_shader_cache.h

@@ -73,6 +73,7 @@ private:
     VideoCore::ShaderNotify& shader_notify;
     const bool use_asynchronous_shaders;
     const bool strict_context_required;
+    bool optimize_spirv_output{};
 
     GraphicsPipelineKey graphics_key{};
     GraphicsPipeline* current_pipeline{};

src/video_core/renderer_vulkan/vk_pipeline_cache.h

@@ -150,6 +150,7 @@ private:
     VideoCore::ShaderNotify& shader_notify;
     bool use_asynchronous_shaders{};
     bool use_vulkan_pipeline_cache{};
+    bool optimize_spirv_output{};
 
     GraphicsPipelineCacheKey graphics_key{};
     GraphicsPipeline* current_pipeline{};