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x86/x64: Change ipairs_aux to match JIT backend behavior.

Thanks to Sergey Kaplun.

(cherry picked from commit 64b1f1083)

In the single-number VM, `ipairs_aux()` first adds the 1 to the given
number and only after casts it to an integer. This leads to results
different from PUC Rio Lua 5.1 and inconsistent with JIT engine
recording.

This patch fixes it by casting the value to an integer before addition.

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

Part of tarantool/tarantool#12480

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