[patch] cfglayout fixes

[Steven Bosscher]

On Wed, Dec 12, 2012 at 1:17 PM, Steven Bosscher wrote:
> I'll resubmit for GCC 4.9. Instead of a test case, I have a verifier
> queued that asserts no BARRIERs appear in the insns stream when in
> cfglayout mode. (This verifier currently breaks hot-cold partitioning
> all over the place due to a bug in try_redirect_by_replacing_jump.)

BTW, should there be a meta-bug for patches for GCC 4.9?

Ciao!
Steven