clang (and newer gcc at high -O) are unaware that objects placed in strange

sections, such as __attribute__((section(".openbsd.randomdata"))), may be
non-zero.  In combination with "const" or "static" the compiler becomes even
more sure nothing can influence the object and assumes the value will be 0.
A few optimizations later, a security requirement has been removed.

Until a better annotation arrives in compilers, be warned:  Do not mix
const or static with these random objects, you won't get what you want.
Spotted in a regression test by bluhm, long discussion with kettenis.

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