patch 8.2.2300: Vim9: wrong order on type stack when using dict

Problem:    Vim9: wrong order on type stack when using dict.
Solution:   Generate constants before a dict. (closes #7619)

Author: brammool

src/testdir/test_vim9_expr.vim

@@ -1094,6 +1094,8 @@ def Test_expr5()
 
       $ENVVAR = 'env'
       assert_equal('aenv', 'a' .. $ENVVAR)
+
+      assert_equal('val', '' .. {key: 'val'}['key'])
   END
   CheckDefAndScriptSuccess(lines)
 enddef

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2300,
 /**/
     2299,
 /**/

src/vim9compile.c

@@ -3027,6 +3027,8 @@ compile_dict(char_u **arg, cctx_T *cctx, ppconst_T *ppconst)
 
     if (d == NULL)
 	return FAIL;
+    if (generate_ppconst(cctx, ppconst) == FAIL)
+	return FAIL;
     for (;;)
     {
 	char_u	    *key = NULL;