ptx preliminary rtl patches [4/4]
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
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