vim-patch:8.0.1505: debugger can't break on a condition

Problem:    Debugger can't break on a condition. (Charles Campbell)
Solution:   Add ":breakadd expr". (Christian Brabandt, closes vim/vim#859)
c6f9f739d3

Do not port "has_watchexpr()" to avoid dead code.
"has_watchexpr()" always returns 0 because "debug_expr" is always 0.

Restore "eval_expr()" as a wrapper to allocate "typval_T" for "eval0()".
Remove it in later patches.

Include "typval_compare()" changes from patch v8.1.0958,
partially ported in 8b60368c1b.

Close https://github.com/neovim/neovim/pull/12373

N/A patches for version.c:

vim-patch:8.2.2720: GTK menu tooltip moves the cursor

Problem:    GTK menu tooltip moves the cursor.
Solution:   Position the cursor after displaying the tooltip.  Do not show the
            tooltip when editing the command line.
01ac0a1f66

src/nvim/eval.h

@@ -227,6 +227,19 @@ typedef enum
   ASSERT_OTHER,
 } assert_type_T;
 
+/// types for expressions.
+typedef enum {
+  TYPE_UNKNOWN = 0,
+  TYPE_EQUAL,         ///< ==
+  TYPE_NEQUAL,        ///< !=
+  TYPE_GREATER,       ///< >
+  TYPE_GEQUAL,        ///< >=
+  TYPE_SMALLER,       ///< <
+  TYPE_SEQUAL,        ///< <=
+  TYPE_MATCH,         ///< =~
+  TYPE_NOMATCH,       ///< !~
+} exptype_T;
+
 /// Type for dict_list function
 typedef enum {
   kDictListKeys,  ///< List dictionary keys.