PS: Fix 'getEnclosingScope' and add 'getEnclosingFunction'.

Author: MathiasVP

powershell/ql/lib/semmle/code/powershell/Ast.qll

@@ -8,5 +8,7 @@ class Ast extends @ast {
 
   Location getLocation() { none() }
 
-  final Scope getEnclosingScope() { result = scopeOf(this) }
+  Scope getEnclosingScope() { result = scopeOf(this) }
+
+  final Function getEnclosingFunction() { this.getEnclosingScope() = result.getBody() }
 }

powershell/ql/lib/semmle/code/powershell/ScriptBlock.qll

@@ -1,4 +1,5 @@
 import powershell
+private import semmle.code.powershell.controlflow.internal.Scope
 
 class ScriptBlock extends @script_block, Ast {
   predicate isTopLevel() { not exists(this.getParent()) }
@@ -48,4 +49,6 @@ class ScriptBlock extends @script_block, Ast {
   }
 
   ModuleSpecification getAModuleSpecification() { result = this.getModuleSpecification(_) }
+
+  final override Scope getEnclosingScope() { result = this }
 }