patch 9.0.1805: Vim9: problem compiling object method as function call arg

Problem:  Vim9: problem compiling object method as function call arg
Solution: After a object/class method call, remove the object/class from
          the stack.

closes: #12081
closes: #12929

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>
diff --git a/src/vim9instr.c b/src/vim9instr.c
index 3e9c6b6..ba1aa0c 100644
--- a/src/vim9instr.c
+++ b/src/vim9instr.c
@@ -1902,6 +1902,10 @@
     // drop the argument types
     cctx->ctx_type_stack.ga_len -= argcount;
 
+    // For an object or class method call, drop the object/class type
+    if (ufunc->uf_class != NULL)
+	cctx->ctx_type_stack.ga_len--;
+
     // add return type
     return push_type_stack(cctx, ufunc->uf_ret_type);
 }