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This CL adds a test that creates a callback from operating system
code to a module that has CFG enabled where the callback is not
listed as a valid indirect target.

Note: this test does not require dispatch guards to be present
in chromium code, just for them to be present in OS code and
for the CFG load config to be generated correctly.

BUG=584575

Change-Id: Id6f5f4061f7237c23f08c8fe1b7471ea200f0628
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308854
Commit-Queue: Will Harris <wfh@chromium.org>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790587}