[Bug web/78315] "Changes" don't explain what "LRA" is

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78315

--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
The "Changes" page for gcc-7 at least says now that LRA is "(a new local
register allocator)"; is that enough?