Clean up '#if CORE' in Utils.cs (#4397)

src/Microsoft.Management.Infrastructure.CimCmdlets/Utils.cs

@@ -214,10 +214,6 @@ namespace Microsoft.Management.Infrastructure.CimCmdlets
         #region runtime methods
         internal static string GetSourceCodeInformation(bool withFileName, int depth)
         {
-#if CORECLR
-            //return a dummy string as StackFrame won't be available on CoreCLR
-            return string.Format(CultureInfo.CurrentUICulture, "{0}::{1}        ", "Type", "Method");
-#else
             StackTrace trace = new StackTrace();
             StackFrame frame = trace.GetFrame(depth);
             //if (withFileName)
@@ -231,8 +227,6 @@ namespace Microsoft.Management.Infrastructure.CimCmdlets
             return string.Format(CultureInfo.CurrentUICulture, "{0}::{1}        ",
                 frame.GetMethod().DeclaringType.Name,
                 frame.GetMethod().Name);
-
-#endif
         }
         #endregion