ptx preliminary rtl patches [4/4]

Bernd Schmidt
Thu Sep 11 13:28:00 GMT 2014

It turns out that we're calling eliminate_regs for global variables 
which can't possibly have eliminable regs in their decl. At that point, 
reg_eliminate can be NULL. This patch avoids unnecessary work, and 
allows us to add an assert to eliminate_regs later.

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

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