Use a new approach for shader BRX targets (#2532)

* Use a new approach for shader BRX targets

* Make shader cache actually work

* Improve the shader pattern matching a bit

* Extend LDC search to predecessor blocks, catches more cases

* Nit

* Only save the amount of constant buffer data actually used. Avoids crashes on partially mapped buffers

* Ignore Rd on predicate instructions, as they do not have a Rd register (catches more cases)

Ryujinx.Graphics.Gpu/Shader/ShaderCompileTask.cs

@@ -1,5 +1,4 @@
 using Ryujinx.Graphics.GAL;
-using System;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -20,6 +19,8 @@ namespace Ryujinx.Graphics.Gpu.Shader
         private ShaderCompileTaskCallback _action;
         private AutoResetEvent _taskDoneEvent;
 
+        public bool IsFaulted => _programsTask.IsFaulted;
+
         /// <summary>
         /// Create a new shader compile task, with an event to signal whenever a subtask completes.
         /// </summary>