chore: sanitizer builds should have debug symbols. (#434)
chore: sanitizer builds should have debug symbols. (#434)

Without debug symbols the error messages are really hard to grok.
Compile with -Og -g for all sanitizer builds.
googleapis/google-cloud-cpp-spanner,googleapis/google-cloud-cpp-spanner,googleapis/google-cloud-cpp-spanner,googleapis/google-cloud-cpp-spanner