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Both `otool` and `atos` commands needed to be run with the hermetic
xcode paths. The code will first check that the hermetic xcode paths
exists before using that path.

Bug: 1113466
Change-Id: I11304f1981faf55946d3aa6fde44af631c87dc3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340795
Commit-Queue: Stephanie Kim <kimstephanie@google.com>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799292}