x86: add additional test cases for sse exceptions to emulator.c

Add additional test cases for sse instructions for doing unaligned
accesses and accesses that cross page boundaries.

Signed-off-by: Jacob Xu <jacobhxu@google.com>
Message-Id: <20210421231258.2583654-2-jacobhxu@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>