This patch moves LoadModule() to it's own file from
process_reader_linux_test.cc so that it may be used in
other tests that interact with loaded modules.
Change-Id: Ie4f7932d65710fc3e20b6e2488e497c5aab27cdd
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2569882
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Joshua Peraza <jperaza@chromium.org>
