C#: Do not bind comments to compiler generated statements.

Author: michaelnebel

csharp/extractor/Semmle.Extraction.CSharp/Entities/Statement`1.cs

@@ -10,12 +10,15 @@ internal abstract class Statement<TSyntax> : Statement where TSyntax : CSharpSyn
         protected readonly TSyntax Stmt;
         private readonly Location location;
 
-        protected Statement(Context cx, TSyntax stmt, Kinds.StmtKind kind, IStatementParentEntity parent, int child, Location location)
+        protected Statement(Context cx, TSyntax stmt, Kinds.StmtKind kind, IStatementParentEntity parent, int child, Location location, bool isCompilerGenerated = false)
             : base(cx, kind, parent, child)
         {
             Stmt = stmt;
             this.location = location;
-            cx.BindComments(this, location.Symbol);
+            if (!isCompilerGenerated)
+            {
+                cx.BindComments(this, location.Symbol);
+            }
         }
 
         protected Statement(Context cx, TSyntax stmt, Kinds.StmtKind kind, IStatementParentEntity parent, int child)

csharp/extractor/Semmle.Extraction.CSharp/Entities/Statements/SyntheticEmptyBlock.cs

@@ -9,7 +9,7 @@ namespace Semmle.Extraction.CSharp.Entities.Statements
     internal class SyntheticEmptyBlock : Statement<BlockSyntax>
     {
         private SyntheticEmptyBlock(Context cx, BlockSyntax block, IStatementParentEntity parent, int child, Location location)
-            : base(cx, block, StmtKind.BLOCK, parent, child, location) { }
+            : base(cx, block, StmtKind.BLOCK, parent, child, location, isCompilerGenerated: true) { }
 
         public static SyntheticEmptyBlock Create(Context cx, IStatementParentEntity parent, int child, Location location)
         {