no need to freeze the CLM for the whole AbstractCommonUpdateAction

Originally (d7ecb297) there was freeze of VcsDirtyScopeManager,
later (c84760e) it was changed to the freeze of CLM which happened to be
incorrect (6646f04 IDEA-156339).

However, it seems that there is no reason to freeze the VDSM here:
* d7ecb297 states "refresh of local changes is buffered while updating",
  but VDSM will cause CLM update only after VFS refresh events,
  which should be triggered by refresh() calls only after update
  procedure is completed.
* In git a large part of Update Project procedure duration is fetch,
  and there is no harm to edit during the fetch.
  When it comes to change of the working tree (stash + merge/rebase),
  GitUpdateProcess performs the freeze itself.

platform/vcs-impl/src/com/intellij/openapi/vcs/update/AbstractCommonUpdateAction.java

@@ -331,36 +331,9 @@ public abstract class AbstractCommonUpdateAction extends AbstractVcsAction {
       ++ myUpdateNumber;
     }
 
-    private void suspendIfNeeded() {
-      if (! myActionInfo.canChangeFileStatus()) {
-        // i.e. for update but not for integrate or status
-        myChangeListManager.freezeImmediately(null);
-      }
-    }
-
-    private void releaseIfNeeded() {
-      if (! myActionInfo.canChangeFileStatus()) {
-        // i.e. for update but not for integrate or status
-        myChangeListManager.letGo();
-      }
-    }
-
     @Override
     public void run(@NotNull final ProgressIndicator indicator) {
-      suspendIfNeeded();
-      try {
-        runImpl();
-      }
-      catch (Throwable t) {
-        releaseIfNeeded();
-        if (t instanceof Error) {
-          throw ((Error)t);
-        }
-        else if (t instanceof RuntimeException) {
-          throw ((RuntimeException)t);
-        }
-        throw new RuntimeException(t);
-      }
+      runImpl();
     }
 
     private void runImpl() {
@@ -475,12 +448,7 @@ public abstract class AbstractCommonUpdateAction extends AbstractVcsAction {
 
     @Override
     public void onSuccess() {
-      try {
-        onSuccessImpl(false);
-      }
-      finally {
-        releaseIfNeeded();
-      }
+      onSuccessImpl(false);
     }
 
     private void onSuccessImpl(final boolean wasCanceled) {
@@ -621,12 +589,7 @@ public abstract class AbstractCommonUpdateAction extends AbstractVcsAction {
 
     @Override
     public void onCancel() {
-      try {
-        onSuccessImpl(true);
-      }
-      finally {
-        releaseIfNeeded();
-      }
+      onSuccessImpl(true);
     }
   }
 }