Do not match lock if lockObj is used in or after the try block.

ICSharpCode.Decompiler/IL/Transforms/LockTransform.cs

@@ -60,6 +60,8 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 				return false;
 			if (!(body.FinallyBlock is BlockContainer finallyContainer) || !MatchExitBlock(finallyContainer.EntryPoint, null, objectStore.Variable))
 				return false;
+			if (objectStore.Variable.LoadCount > 1)
+				return false;
 			context.Step("LockTransformV2", block);
 			block.Instructions.RemoveAt(i - 1);
 			block.Instructions.RemoveAt(i - 2);
@@ -102,6 +104,8 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 				return false;
 			if (!(body.FinallyBlock is BlockContainer finallyContainer) || !MatchExitBlock(finallyContainer.EntryPoint, flagStore.Variable, objectStore.Variable))
 				return false;
+			if (objectStore.Variable.LoadCount > 1)
+				return false;
 			context.Step("LockTransformV4", block);
 			block.Instructions.RemoveAt(i - 1);
 			tryContainer.EntryPoint.Instructions.RemoveAt(0);
@@ -145,6 +149,8 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 				return false;
 			if (!(body.FinallyBlock is BlockContainer finallyContainer) || !MatchExitBlock(finallyContainer.EntryPoint, flagStore.Variable, objectStore.Variable))
 				return false;
+			if (objectStore.Variable.LoadCount > 2)
+				return false;
 			context.Step("LockTransformRoslyn", block);
 			block.Instructions.RemoveAt(i - 1);
 			block.Instructions.RemoveAt(i - 2);