Shader: Align clip distance init with declared outputs

Cause: vertex output initialization wrote ClipDistance[0..7] whenever any clip distance was used, while vtg-as-compute output reservations can be sparse.

Effect: the mismatch could leave unreserved ClipDistance stores in the IR path and trigger downstream translation failures.

Fix: initialize only the ClipDistance components flagged in ClipDistancesWritten by iterating the bitmask with BitOperations.TrailingZeroCount.

src/Ryujinx.Graphics.Shader/Translation/Translator.cs

@@ -2,6 +2,7 @@ using Ryujinx.Graphics.Shader.Decoders;
 using Ryujinx.Graphics.Shader.IntermediateRepresentation;
 using System;
 using System.Linq;
+using System.Numerics;
 using static Ryujinx.Graphics.Shader.IntermediateRepresentation.OperandHelper;
 
 namespace Ryujinx.Graphics.Shader.Translation
@@ -259,12 +260,15 @@ namespace Ryujinx.Graphics.Shader.Translation
                 context.Store(StorageKind.Output, IoVariable.Position, null, Const(c), ConstF(c == 3 ? 1f : 0f));
             }
 
-            if (context.Program.ClipDistancesWritten != 0)
+            int clipDistancesWrittenMap = context.Program.ClipDistancesWritten;
+
+            while (clipDistancesWrittenMap != 0)
             {
-                for (int i = 0; i < 8; i++)
-                {
-                    context.Store(StorageKind.Output, IoVariable.ClipDistance, null, Const(i), ConstF(0f));
-                }
+                int index = BitOperations.TrailingZeroCount(clipDistancesWrittenMap);
+
+                context.Store(StorageKind.Output, IoVariable.ClipDistance, null, Const(index), ConstF(0f));
+
+                clipDistancesWrittenMap &= ~(1 << index);
             }
         }