Avoid signed int overflow in JsonIn::get_int and JsonIn::get_int64 #38453
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ZhilkinSerg
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<Bugfix>
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Summary
SUMMARY: None
Purpose of change
Should fix #36808. Use more elaborate code to avoid potential signed integer overflow, and add static assertions of the code's assumptions.
Testing
Game compiles and loads without problem, but I don't have UBSAN at hand to test if it fixes the overflow.