[committed] Fix ICE in pa_output_function_epilogue

[John David Anglin]

The attached change fixes a segmentation fault that occurs building  
llvm-toolchain-3.4.

Tested on hppa-unknown-linux-gnu.  Committed to trunk, 4.9 and 4.8  
branches.

Dave
--
John David Anglin	dave.anglin@bell.net


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