Fix pointer overflow of `(uint8 *)symbol_addr + reloc_addend` detected by UBSan: ``` core/iwasm/aot/arch/aot_reloc_x86_64.c:232:43: runtime error: addition of unsigned offset to 0x000041209004 overflowed to 0x000041209000 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior core/iwasm/aot/arch/aot_reloc_x86_64.c:232:43 ```
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