Make structs readonly when applicable (#4002)

* Make all structs readonly when applicable. It should reduce amount of needless defensive copies

* Make structs with trivial boilerplate equality code record structs

* Remove unnecessary readonly modifiers from TextureCreateInfo

* Make BitMap structs readonly too

1 files changed, 1 insertions, 1 deletions

diff --git a/ARMeilleure/Translation/RegisterUsage.cs b/ARMeilleure/Translation/RegisterUsage.cs
index 775fa3ab..3ec0a7b4 100644
--- a/ARMeilleure/Translation/RegisterUsage.cs
+++ b/ARMeilleure/Translation/RegisterUsage.cs
@@ -14,7 +14,7 @@ namespace ARMeilleure.Translation
         private const int RegsCount = 32;
         private const int RegsMask  = RegsCount - 1;
 
-        private struct RegisterMask : IEquatable<RegisterMask>
+        private readonly struct RegisterMask : IEquatable<RegisterMask>
         {
             public long IntMask => Mask.GetElement(0);
             public long VecMask => Mask.GetElement(1);