Index: /branches/working-0711/ccl/compiler/X86/X8664/x8664-arch.lisp
===================================================================
--- /branches/working-0711/ccl/compiler/X86/X8664/x8664-arch.lisp	(revision 8009)
+++ /branches/working-0711/ccl/compiler/X86/X8664/x8664-arch.lisp	(revision 8010)
@@ -1319,4 +1319,9 @@
 (defconstant recover-fn-from-rip-byte2 #x2d)
 
+;;; For backtrace: the relative PC of an argument-check trap
+;;; must be less than or equal to this value.  (Because of
+;;; the way that we do "anchored" UUOs, it should always be =.)
+
+(defconstant arg-check-trap-pc-limit 7)
 
 (provide "X8664-ARCH")