target/i386: emulate: Make sure fetch_instruction exist before calling it Currently, this function is only available in MSHV. If a different accelerator is used, and the code jumps to this section, a segfault will occur. (I ran into this with HVF) Signed-off-by: Nguyen Dinh Phi <phind.uet@gmail.com> Link: https://lore.kernel.org/r/20251114082915.71884-2-phind.uet@gmail.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>