[Bug target/58110] Useless GPR push and pop when only xmm registers are used.

[vmakarov at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58110

--- Comment #3 from Vladimir Makarov <vmakarov at redhat dot com> ---
Thanks, Ondrej and Jan.  GCC with reload generates code with the same problem.

I mentioned on RA BOF that we should look at postreload.c and postreload-gcse.c
to figure out what should and can be removed as redundant and what can be
integrated with IRA/LRA.  This PR is just a good illustration of why it should
be done.

I don't think this work will be done soon but it is good to have the PR to
remember this.