ptx preliminary rtl patches [1/4]

Bernd Schmidt
Thu Sep 11 13:25:00 GMT 2014

The nvptx backend is somewhat unusual in that call insns set a pseudo. 
The combiner is surprised by this and allows combining them into other 
insns, which remain as INSN rather than CALL_INSN. Aborts ensue.

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

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