uc->target_page_align is a uint32_t. When the binary not will only
invert the 32 bit of the value. Used this in a binary and operator with
a uint64_t will case the upper 32bit of the address to be 0. Therefor
the bug only appears when the upper 32bit of the address are used.
Now a local uint64_t variable is used for the alignemend and the test
uses a not page alligned address which does not fit in 32bit.
Uses Copy on Write to make it posible to restore the memory state after a snapshot
was made. To restore all MemoryRegions created after the snapshot are removed.
On machines with a page size larger than 4K, the requested memory size
in `test_map_big_memory` gets rounded up and overflows to zero.
This PR adds some code to query the page size and adjust the requested
memory size accordingly.
