Fix test for lazy source positions

Disable bytecode flushing for test as it messes up lazy source
positions and the flags aren't representative anyway.

Bug: v8:8510
Change-Id: I6d5bc8dcd174a9bfc48f682518e6c62d79acb691
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1658152
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Auto-Submit: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62155}

test/mjsunit/compiler/dataview-deopt.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --opt --no-always-opt
+// Flags: --allow-natives-syntax --opt --no-always-opt --no-stress-flush-bytecode
 
 // Check that there are no deopt loops for DataView methods.