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Fix bit op coercion in DUALNUM builds.

Thanks to Sergey Kaplun.

(cherry picked from commit f5fd22203)

The `lj_carith_check64()` function coerces the given number value to the
32-bit wide value. In this case, the 64-bit-wide operands will lose
upper bits.

This patch removes the excess coercion for the DUALNUM mode and drops
the corresponding skipcond introduced for the test in the previous
commit.

Sergey Kaplun:
* added the description and the test for the problem

Part of tarantool/tarantool#10199

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