patch 9.0.0370: cleaning up afterwards can make a function messy

Problem:    Cleaning up afterwards can make a function messy.
Solution:   Add the :defer command.
diff --git a/src/proto/vim9instr.pro b/src/proto/vim9instr.pro
index 8a3254b..b0f3aa4 100644
--- a/src/proto/vim9instr.pro
+++ b/src/proto/vim9instr.pro
@@ -23,7 +23,7 @@
 int generate_PUSHCHANNEL(cctx_T *cctx);
 int generate_PUSHJOB(cctx_T *cctx);
 int generate_PUSHBLOB(cctx_T *cctx, blob_T *blob);
-int generate_PUSHFUNC(cctx_T *cctx, char_u *name, type_T *type);
+int generate_PUSHFUNC(cctx_T *cctx, char_u *name, type_T *type, int may_prefix);
 int generate_AUTOLOAD(cctx_T *cctx, char_u *name, type_T *type);
 int generate_GETITEM(cctx_T *cctx, int index, int with_op);
 int generate_SLICE(cctx_T *cctx, int count);
@@ -52,6 +52,7 @@
 int generate_CALL(cctx_T *cctx, ufunc_T *ufunc, int pushed_argcount);
 int generate_UCALL(cctx_T *cctx, char_u *name, int argcount);
 int generate_PCALL(cctx_T *cctx, int argcount, char_u *name, type_T *type, int at_top);
+int generate_DEFER(cctx_T *cctx, int var_idx, int argcount);
 int generate_STRINGMEMBER(cctx_T *cctx, char_u *name, size_t len);
 int generate_ECHO(cctx_T *cctx, int with_white, int count);
 int generate_MULT_EXPR(cctx_T *cctx, isntype_T isn_type, int count);