master: Undo a couple lines of prior change

The branch "master" has been updated in SBCL:
       via  e1f589db879b6862b635b15b45c79cc6466996a7 (commit)
      from  976cf627663cea74fba0789689e36cfdbc3eef5a (commit)

- Log -----------------------------------------------------------------
commit e1f589db879b6862b635b15b45c79cc6466996a7
Author: Douglas Katzman <[email protected]>
Date:   Wed Apr 15 18:08:14 2026 -0400

    Undo a couple lines of prior change
    
    Rev 976cf627 removed the :elide-if which I thought was reasonable, but nope.
---
 src/compiler/x86-64/cell.lisp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/compiler/x86-64/cell.lisp b/src/compiler/x86-64/cell.lisp
index 94335da60..3a6805921 100644
--- a/src/compiler/x86-64/cell.lisp
+++ b/src/compiler/x86-64/cell.lisp
@@ -306,7 +306,9 @@
   #-immobile-space (:temporary (:sc unsigned-reg) temp)
   (:vop-var vop)
   (:generator 1
-   (pseudo-atomic () ; assume software card marking
+   ;; If the OBJECT is an immobile symbol, this has to pseudo-atomic. But equally importantly
+   ;; with #+permgen this MUST NOT be pseudo-atomic, because REMSET-INSERT uses pseudo-atomic.
+   (pseudo-atomic (:elide-if (or #-immobile-space t))
     (gcbar)
     ;; I think this has :LOCK because I want the 3 lowest bits to be
     ;; flags which might undergo concurrent modification.
@@ -320,7 +322,7 @@
   #-immobile-space (:temporary (:sc unsigned-reg) temp)
   (:vop-var vop)
   (:generator 1
-   (pseudo-atomic () ; assume software card marking
+   (pseudo-atomic (:elide-if (or #-immobile-space t))
     (gcbar)
     (storew function object fdefn-fun-slot other-pointer-lowtag)
     (unless (and (sc-is linkage-val immediate) (zerop (tn-value linkage-val)))

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