[LINUX/CPU/BASE] Added System-V ABI support in x64 backend & fixed mmap initialization #2228
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Current thunks in x64_backend.cc assumed that the calling convention is Microsoft ABI. Added an implementation for the System-V ABI which is used in Unix(-like) systems (Linux/MacOS/FreeBSD/etc).
When memory mapping a file, we should ensure it is large enough.
See:
https://wiki.osdev.org/System_V_ABI
https://man7.org/linux/man-pages/man2/mmap.2.html