Drop -Wswitch-bool warning in function.c

[Kito Cheng]

Bootstrapped & regression-tested on x86_64-linux-gnu :)

2015-07-08  Kito Cheng  <kito.cheng@gmail.com>

        * function.c (stack_protect_epilogue): Use if rather than switch for
        check targetm.have_stack_protect_test().
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