[vk] Implement Shader Read Barrier (#2671)

Adding the shader read barrier keeps every render/compute/transfer write visible before the image is sampled, so it prevents the “read-before-writes-finish” hazards. Without it you can get random stale frames, flickering post process passes, partially updated HUD textures, and corrupted depth-to-color conversions especially in scenes that render into an offscreen image and immediately feed that image to a shader (reflections, bloom, dynamic resolution, depth visualizers, etc.). This fix makes those R2T chains deterministic again across all Vulkan drivers.

Co-authored-by: Ribbit <ribbit@placeholder.com>
Reviewed-on: #2671
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: crueter <crueter@eden-emu.dev>
Co-authored-by: Ribbit <ribbit@eden-emu.dev>
Co-committed-by: Ribbit <ribbit@eden-emu.dev>

src/video_core/engines/maxwell_dma.cpp

@@ -156,6 +156,8 @@ void MaxwellDMA::Launch() {
 }
 
 void MaxwellDMA::CopyBlockLinearToPitch() {
+   
+
     u32 bytes_per_pixel = 1;
     DMA::ImageOperand src_operand;
     src_operand.bytes_per_pixel = bytes_per_pixel;