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The WebKit build directory contains a copy of
libclang_rt.asan_osx_dynamic.dylib inside
WebKitTestRunnerApp.app. This file is also needed at the top
level when fuzzing, since trying to dynamically load a
version of this library from other locations leads to crashes.

This CL makes copy_webkit_for_clusterfuzz.py copy this
library to the top level, and makes run-clusterfuzz.sh set
DYLD_LIBRARY_PATH to this top level directory.

Bug: 1064181
Change-Id: I7de42891c39c12ae422beb6e8031745ff36640b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2202682Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Ali Juma <ajuma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768984}