Fix some DX tests.

* DX value cells don't exist.
* Don't conditionalize out tests based on platform. It's ok to
fail. (Otherwise we never realize what does or doesn't work.) I'm
pretty sure some of these work on the conditionalized out platforms
now anyway, case in point.

Author: karlosz

tests/dynamic-extent.pure.lisp

@@ -172,10 +172,7 @@
 ;;; value-cells
 
 (defun-with-dx dx-value-cell (x)
-  ;; Not implemented everywhere, yet.
-  #+(or arm64 x86 x86-64 mips)
   (let ((cell x))
-    (declare (sb-int:truly-dynamic-extent cell))
     (flet ((f ()
              (incf cell)))
       (declare (dynamic-extent #'f))
@@ -330,7 +327,7 @@
   (sb-int:dx-let ((s (make-list-container :listy-slot (make-list n))))
     (values (funcall (the function thunk) s))))
 ;; stack-allocatable lists are necessary but not sufficient
-(with-test (:name (:dx-list :make-list) :skipped-on (not :x86-64))
+(with-test (:name (:dx-list :make-list) :fails-on (not :x86-64))
   (let ((calls (ctu:asm-search "CALL" #'make-var-length-dx-list)))
     ;; Call nothing but the funarg
     (assert (eql (length calls) 1)))
@@ -340,7 +337,7 @@
 ;;; MAKE-STRUCTURE
 
 ;; stack-allocatable fixed-size objects are necessary but not sufficient
-(with-test (:name :copy-structure-dx :skipped-on (not (or :x86 :x86-64)))
+(with-test (:name :copy-structure-dx :fails-on (not (or :x86 :x86-64)))
   (let ((thing sb-c::*backend-parsed-vops*))
     ;; check some preconditions
     (assert (typep thing 'hash-table))
@@ -874,7 +871,6 @@
     (assert (every (lambda (x) (eql x 0)) a))))
 
 (with-test (:name (:dx-bug-misc :bdowning-2005-iv-16))
-  #+(or arm64 mips x86 x86-64)
   (assert-no-consing (bdowning-2005-iv-16))
   (bdowning-2005-iv-16))
 
@@ -929,7 +925,6 @@
       (multiple-value-bind (y pos2) (read-from-string res nil nil :start pos)
         (assert (equalp f2 y))
         (assert (equalp f3 (read-from-string res nil nil :start pos2))))))
-  #+(or arm64 mips x86 x86-64)
   (assert-no-consing (assert (eql n (funcall fun nil))))
   (assert (eql n (funcall fun nil))))