[Patch] Fix PR41440 bad edge insertion

[Michael Matz]

Hi,

On Thu, 1 Oct 2009, andrewhutchinson@cox.net wrote:

> After discussion with Micael Matz, the preferred method is fix the 
> problem at the point of RTL expansion. A block that ends with a jump 
> created by RTL expander on an otherwise fallthru edge, is now padded 
> with mov(r,r) NOP.

I can't approve this but (obviously) think this is the right way.  In 
addition you might want to pad only when something is queued on that edge 
(edge->r.insns != NULL) to not generate excessive nop moves.  Probably 
doesn't matter that much, though.


Ciao,
Michael.