[GPU] Vulkan fragment shader interlock RB and related fixes/cleanup

Also fixes addressing of MSAA samples 2 and 3 for 64bpp color render targets in the ROV RB implementation on Direct3D 12.
Additionally, with FSI/ROV, alpha test and alpha to coverage are done only if the render target 0 was dynamically written to (according to the Direct3D 9 rules for writing to color render targets, though not sure if they actually apply to the alpha tests on Direct3D 9, but for safety).
There is also some code cleanup for things spotted during the development of the feature.

src/xenia/gpu/vulkan/vulkan_command_processor.h

@@ -16,6 +16,7 @@
 #include <deque>
 #include <functional>
 #include <memory>
+#include <string>
 #include <unordered_map>
 #include <utility>
 #include <vector>
@@ -256,6 +257,9 @@ class VulkanCommandProcessor : public CommandProcessor {
   void SetViewport(const VkViewport& viewport);
   void SetScissor(const VkRect2D& scissor);
 
+  // Returns the text to display in the GPU backend name in the window title.
+  std::string GetWindowTitleText() const;
+
  protected:
   bool SetupContext() override;
   void ShutdownContext() override;
@@ -437,7 +441,8 @@ class VulkanCommandProcessor : public CommandProcessor {
       bool primitive_polygonal,
       const PrimitiveProcessor::ProcessingResult& primitive_processing_result,
       bool shader_32bit_index_dma, const draw_util::ViewportInfo& viewport_info,
-      uint32_t used_texture_mask);
+      uint32_t used_texture_mask, reg::RB_DEPTHCONTROL normalized_depth_control,
+      uint32_t normalized_color_mask);
   bool UpdateBindings(const VulkanShader* vertex_shader,
                       const VulkanShader* pixel_shader);
   // Allocates a descriptor set and fills one or two VkWriteDescriptorSet
@@ -514,12 +519,12 @@ class VulkanCommandProcessor : public CommandProcessor {
 
   // Descriptor set layouts used by different shaders.
   VkDescriptorSetLayout descriptor_set_layout_empty_ = VK_NULL_HANDLE;
-  VkDescriptorSetLayout descriptor_set_layout_shared_memory_and_edram_ =
-      VK_NULL_HANDLE;
   VkDescriptorSetLayout descriptor_set_layout_constants_ = VK_NULL_HANDLE;
   std::array<VkDescriptorSetLayout,
              size_t(SingleTransientDescriptorLayout::kCount)>
       descriptor_set_layouts_single_transient_{};
+  VkDescriptorSetLayout descriptor_set_layout_shared_memory_and_edram_ =
+      VK_NULL_HANDLE;
 
   // Descriptor set layouts are referenced by pipeline_layouts_.
   std::unordered_map<TextureDescriptorSetLayoutKey, VkDescriptorSetLayout,
@@ -649,6 +654,9 @@ class VulkanCommandProcessor : public CommandProcessor {
   // declared as dynamic in the pipeline) invalidates such dynamic state.
   VkViewport dynamic_viewport_;
   VkRect2D dynamic_scissor_;
+  // Dynamic fixed-function depth bias, blend constants, stencil state are
+  // applicable only to the render target implementations where they are
+  // actually involved.
   float dynamic_depth_bias_constant_factor_;
   float dynamic_depth_bias_slope_factor_;
   float dynamic_blend_constants_[4];