Update the emitter to take advantage of the new insFlags

Author: tannergooding

src/coreclr/jit/emit.h

@@ -1109,7 +1109,7 @@ class emitter
         }
 #endif // TARGET_LOONGARCH64
 
-        emitAttr idOpSize()
+        emitAttr idOpSize() const
         {
             return emitDecodeSize(_idOpSize);
         }