K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2018-09-20T13:29:43.846383Z
K 7
svn:log
V 534
amd64: move fusufault after all users

A lot of function have the following check:
        cmpq    %rax,%rdi                       /* verify address is valid */
        ja      fusufault

The label is present earlier in kernel .text, which means this is a jump
backwards. Absent any information in branch predictor, the cpu predicts it
as taken. Since it is almost never taken in practice, this results in a
completely avoidable misprediction.

Move it past all consumers, so that it is predicted as not taken.

Approved by:	re (kib)

END