[PATCH, rs6000]: mark clobber for registers changed by untpyed_call

[Segher Boessenkool]

On Sat, Feb 08, 2020 at 10:17:42AM -0600, Segher Boessenkool wrote:
> And we do not know which of the register will be used for the return, in
> untyped_call (only untyped-return knows).  But we can add clobbers of all
> registers that *might* be used for the return, we do know that here, see
> operands[2] of untyped_call.

Clobbers in parallel to the call, I mean, not as separate insns later.


Segher