GCC 9.4 Release Candidate available

[Richard Biener]

The first release candidate for GCC 9.4 is available from

https://sourceware.org/pub/gcc/snapshots/9.4.0-RC-20210519/

and shortly its mirrors.  It has been generated from git commit
8091c46cf736124a106922ddfd1fdb99f33b0241.

I have so far bootstrapped and tested the release candidate
on {x86_64,i586,aarch64,ppc64le,s390x,riscv64,ppc,ppc64,armv7l}-linux.

Please test it and report any issues to bugzilla.

If all goes well I'd like to release 9.4 on Friday, June 28th.