Address `-Wclass-memaccess' warnings from GCC 10.x.

Change-Id: Iaf84b498f8a63bf862126a12f3db7638ebd12f30
Reviewed-on: https://code-review.googlesource.com/c/re2/+/57798
Reviewed-by: Paul Wankadia <junyer@google.com>
1 file changed