[GPU] Eliminate unused shader I/O, UCP culling, centroid on Vulkan

For more optimal usage of exports and the parameter cache on the host regardless of how effective the optimizations in the host GPU driver are. Also reserve space for Vulkan/Metal/D3D11-specific HostVertexShaderTypes to use one more bit for the host vertex shader type in the shader modification bits, so that won't have to be done in the future as that would require invalidating shader storages (which are invalidated by this commit) again.

src/xenia/gpu/vulkan/vulkan_pipeline_cache.h

@@ -70,9 +70,11 @@ class VulkanPipelineCache {
   // have microcode analyzed.
   SpirvShaderTranslator::Modification GetCurrentVertexShaderModification(
       const Shader& shader,
-      Shader::HostVertexShaderType host_vertex_shader_type) const;
+      Shader::HostVertexShaderType host_vertex_shader_type,
+      uint32_t interpolator_mask) const;
   SpirvShaderTranslator::Modification GetCurrentPixelShaderModification(
-      const Shader& shader, uint32_t normalized_color_mask) const;
+      const Shader& shader, uint32_t interpolator_mask,
+      uint32_t param_gen_pos) const;
 
   bool EnsureShadersTranslated(VulkanShader::VulkanTranslation* vertex_shader,
                                VulkanShader::VulkanTranslation* pixel_shader);
@@ -262,8 +264,10 @@ class VulkanPipelineCache {
   // Whether the pipeline for the given description is supported by the device.
   bool ArePipelineRequirementsMet(const PipelineDescription& description) const;
 
-  static bool GetGeometryShaderKey(PipelineGeometryShader geometry_shader_type,
-                                   GeometryShaderKey& key_out);
+  static bool GetGeometryShaderKey(
+      PipelineGeometryShader geometry_shader_type,
+      SpirvShaderTranslator::Modification vertex_shader_modification,
+      GeometryShaderKey& key_out);
   VkShaderModule GetGeometryShader(GeometryShaderKey key);
 
   // Can be called from creation threads - all needed data must be fully set up