patch 9.0.0217: 'shellslash' works differently when sourcing a script again

Problem:    'shellslash' works differently when sourcing a script again.
Solution:   Use the name from the script item. (closes #10920)
diff --git a/src/scriptfile.c b/src/scriptfile.c
index 952f2ef..053dd06 100644
--- a/src/scriptfile.c
+++ b/src/scriptfile.c
@@ -1534,10 +1534,6 @@
     cookie.level = ex_nesting_level;
 #endif
 
-    // Keep the sourcing name/lnum, for recursive calls.
-    estack_push(ETYPE_SCRIPT, fname_exp, 0);
-    ESTACK_CHECK_SETUP
-
 #ifdef STARTUPTIME
     if (time_fd != NULL)
 	time_push(&tv_rel, &tv_start);
@@ -1630,6 +1626,10 @@
 	si->sn_is_vimrc = is_vimrc;
     }
 
+    // Keep the sourcing name/lnum, for recursive calls.
+    estack_push(ETYPE_SCRIPT, si->sn_name, 0);
+    ESTACK_CHECK_SETUP
+
 # ifdef FEAT_PROFILE
     if (do_profiling == PROF_YES)
     {