Merge pull request github#6303 from hvitved/csharp/get-qual-name-nomagic

C#: Two `pragma` performance fixes

Author: hvitved

csharp/ql/src/semmle/code/csharp/Unification.qll

@@ -485,6 +485,7 @@ module Gvn {
   /**
    * Gets the leaf GVN inside GVN `t`, by following the path `path`, if any.
    */
+  pragma[noinline]
   private GvnType getLeafTypeAt(GvnType t, TTypePath path) {
     result = getTypeAt(t, path) and
     not result instanceof ConstructedGvnType

csharp/ql/src/semmle/code/dotnet/Element.qll

@@ -74,6 +74,7 @@ class NamedElement extends Element, @dotnet_named_element {
    * }
    * ```
    */
+  cached
   final string getQualifiedName() {
     exists(string qualifier, string name | this.hasQualifiedName(qualifier, name) |
       if qualifier = "" then result = name else result = qualifier + "." + name