[Assist] GCC extreme bit-shift by constant vs. by variable

[Michał Masłowski]

> I do not know if it is an error or regular behaviour (i. e. undefined
> by ANSI/ISO C).

It's undefined and should be fixed in the program.  It's sometimes
possible to misconfigure a program to use a 32-bit type for a variable
that is expected to be 64-bit where shifts by 32 are safe.

(To learn why these specific numbers are used, see the generated
assembly.)
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