[Bug target/58320] [4.7 / 4.8 / 4.9 Regression] code used in autoconf test fails with -O2, works with -O0

[schwab@linux-m68k.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58320

--- Comment #2 from Andreas Schwab <schwab@linux-m68k.org> ---
Casting to uintptr_t should probably make this work as intented.