Reduce allocations in GetLocale() (#25531)

diff --git a/src/System.Private.CoreLib/src/System/Reflection/RuntimeAssembly.cs b/src/System.Private.CoreLib/src/System/Reflection/RuntimeAssembly.cs
index 8c60a92..92cd2b8 100644 (file)
--- a/src/System.Private.CoreLib/src/System/Reflection/RuntimeAssembly.cs
+++ b/src/System.Private.CoreLib/src/System/Reflection/RuntimeAssembly.cs
@@ -545,7 +545,7 @@ namespace System.Reflection
             if (locale == null)
                 return CultureInfo.InvariantCulture;
 
-            return new CultureInfo(locale);
+            return CultureInfo.GetCultureInfo(locale);
         }
 
         [MethodImplAttribute(MethodImplOptions.InternalCall)]