Merge pull request #5023 from jroweboy/fix-register-length

Use the correct register length for index_array

src/video_core/regs_pipeline.h

@@ -138,7 +138,8 @@ struct PipelineRegs {
         };
 
         union {
-            BitField<0, 31, u32> offset; // relative to base attribute address
+            BitField<0, 28, u32> offset; // relative to base attribute address
+            BitField<28, 3, u32> unused;
             BitField<31, 1, IndexFormat> format;
         };
     } index_array;