JitArm64: Make HandleFastmemFault less unsafe

HandleFastmemFault works correctly when faults only happen in
expected locations, but it does some things that are rather
dangerous for faults in unexpected locations, like decrementing
an iterator without checking whether it's equal to begin.

This change cleans up the logic by making m_fault_to_handler's
key be the end of the fastmem region instead of the start.

0 files changed, 0 insertions, 0 deletions