cygprofile: Disable resource whitelist when generating the orderfile.

The orderfile must be generated at symbol level 0 in order to avoid
running into binary size limits. Setting the symbol level to 0 is
incompatible with generating a resource whitelist, so disable the
whitelist during orderfile generation.

Bug: 875928
Change-Id: I82e197d5a4a0fe9b9a7142b583b3947b0da56b27
Reviewed-on: https://chromium-review.googlesource.com/1182798Reviewed-by: Benoit L <lizeb@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585161}

tools/cygprofile/orderfile_generator_backend.py

@@ -255,6 +255,7 @@ class ClankCompiler(object):
 
     # Set the "Release Official" flavor, the parts affecting performance.
     args = [
+        'enable_resource_whitelist_generation=false',
         'is_chrome_branded=true',
         'is_debug=false',
         'is_official_build=true',