ptx preliminary rtl patches [2/4]

[Bernd Schmidt]

There's some code in get_uncond_jump_length to emit and then delete a 
label and a jump.  On ptx we skip register allocation and reload, and 
this fails a "reload_completed || bb != NULL" assert in df_insn_delete. 
Fixed by instead emitting the two insns into a sequence which we then 
just discard.

Bootstrapped and tested on x86_64-linux, together with the other 
patches.  Ok?


Bernd
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