Code review comment for ~paelzer/ubuntu/+source/qemu:fix-1832622-ppc-spectre-eoan

The -sxxm where added on IBMs request exactly as requested.
No need to document anything on top for these old changes.
The same applies to the special conditions when using TCG.
But thanks for spotting/mentioning them - was worth to rethink it.

Since for Eoan I'm already merging 4.0 which contains all those patches I'm just adding the bug reference there and call this MP rejected (in favor of 4.0).

The branches for B/C/D should be ok as-is as they are of equal content.
You can give them a short cross check to be sure that you are ok with them as well.