Checks the memory information for the process to compute a more
accurate address for each function.

Bug: angleproject:6070
Change-Id: I57f927f3641298af7921522da0ece683f8fd8faf
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2971838Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Tim Van Patten <timvp@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>