backport https://gitlab.com/embeddable-common-lisp/ecl/-/commit/f3d4cf4b66ab6c3cd8629ab6d0c7f7c50d7fd8a4

Index: src/cmp/cmptables.lsp
--- src/cmp/cmptables.lsp.orig
+++ src/cmp/cmptables.lsp
@@ -182,7 +182,7 @@
 
     (temp . wt-temp)
     (lcl . wt-lcl-loc)
-    (fixnum-value . wt-number)
+    (fixnum-value . wt-fixnum)
     (long-float-value . wt-number)
     (double-float-value . wt-number)
     (single-float-value . wt-number)
