Merge remote-tracking branch 'upstream/master' into back-to-upstream

Sync with upstream
Preparations to sending patch
Fix build with clisp
Remove some #includes from x86-specific files because they are not needed there
Clarify a comment and update an obsolete comment.
Two corrections to MAP-REFERENCING-OBJECTS
Don't use ASH-LEFT-MODFX in MAKE-INFO-DESCRIPTOR in globaldb.

It's sadly unavailable for any backend but x86[-64].
Thanks to stassats for the diagnosis.
Repair build using CLISP as cross-compilation host.

Fixes lp# 1292811
Merge branch 'back-to-upstream'

Fix x86
Merge remote-tracking branch 'upstream/master'

Sync with upstream