C#: match IR global variable changes

csharp/ql/src/experimental/ir/implementation/raw/internal/IRConstruction.qll

@@ -47,6 +47,9 @@ module Raw {
   cached
   predicate functionHasIR(Callable callable) { exists(getTranslatedFunction(callable)) }
 
+  cached
+  predicate varHasIRFunc(Field field) { none() }
+
   cached
   predicate hasInstruction(TranslatedElement element, InstructionTag tag) {
     element.hasInstruction(_, tag, _)

csharp/ql/src/experimental/ir/internal/IRCSharpLanguage.qll

@@ -8,6 +8,14 @@ class OpaqueTypeTag = CSharp::ValueOrRefType;
 
 class Function = CSharp::Callable;
 
+class GlobalVariable extends CSharp::Field {
+  GlobalVariable() {
+    this.isStatic()
+  }
+}
+
+class Declaration = CSharp::Declaration;
+
 class Location = CSharp::Location;
 
 class UnknownLocation = CSharp::EmptyLocation;