GCC 6.4 Release Candidate available from gcc.gnu.org

[Richard Biener]

A release candidate for GCC 6.4 is available from

 ftp://gcc.gnu.org/pub/gcc/snapshots/6.4.0-RC-20170628/

and shortly its mirrors.  It has been generated from SVN revision 249715.

I have so far bootstrapped and tested the release candidate on
x86_64-unknown-linux-gnu.  Please test it and report any issues to
bugzilla.

If all goes well I'd like to release 6.4 on Tuesday, July 4th.