Set the MemAccessSize enum to actual size (#338)

Summary:

Originally, the MemAccessSize value is `n - 1` for short masking code, turn out we didn't use, let's revert it back to original size.

Test Plan:

Co-authored-by: duc-nx <>

Author: duc-nx

common/src/memory/traits.rs

@@ -4,11 +4,10 @@ use std::collections::HashSet;
 
 #[derive(Debug, Clone, Copy, Eq, PartialEq, Hash, Serialize, Deserialize)]
 /// Represents the size of memory access operations.
-/// The value of enum is for efficient masking purpose.
 pub enum MemAccessSize {
-    Byte = 0,
-    HalfWord = 1,
-    Word = 3,
+    Byte = 1,
+    HalfWord = 2,
+    Word = 4,
 }
 
 impl MemAccessSize {