[Bug tree-optimization/117148] `-Os` results in much larger code than `-O2` about bitfields

[lh_mouse at 126 dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117148

--- Comment #2 from LIU Hao <lh_mouse at 126 dot com> ---
Oh, the sample code contained a typo:

   *(intptr_t*) out = ival;

should be

   *(intptr_t*) out = icmp;

However it doesn't affect the bug. (https://godbolt.org/z/fdxbbadnj) It's
because GCC fail to inline `atomic_load_iptr`. Forcing that function to be
inlined with `always_inline` seems a workaround.