Remove unnecessary call to type.GetFields, add test case for literal field (#77497)

src/coreclr/System.Private.CoreLib/src/System/Reflection/RuntimeModule.cs

@@ -153,8 +153,6 @@ public override byte[] ResolveSignature(int metadataToken)
 
             Type declaringType = ResolveType(tkDeclaringType, genericTypeArguments, genericMethodArguments);
 
-            declaringType.GetFields();
-
             try
             {
                 return declaringType.GetField(fieldName,

src/libraries/System.Runtime/tests/System/Reflection/ModuleTests.cs

@@ -41,6 +41,7 @@ namespace System.Reflection.Tests
 {
     public class ModuleTests
     {
+        public const string ConstField = "Value";
         public static Module Module => typeof(ModuleTests).Module;
         public static Module TestModule => typeof(TestModule.Dummy).Module;