Bug#832135: gcc-5: building liburcu on alpha crashes gcc

[Esa Peuha <esa.peuha@gmail.com>]

Package: gcc-5
Version: 5.4.0-6

According to this buildd log

https://buildd.debian.org/status/fetch.php?pkg=liburcu&arch=alpha&ver=0.9.2-3&stamp=1467933496

attempting to build liburcu 0.9.2-3 on alpha makes gcc 5.4.0-6 crash
with an internal compiler error (could not split insn). I don't have
access to an alpha system, so I can't confirm the crash myself, but
this should be simple to verify since the log has the preprocessed
source that gcc outputs when it crashes.