patch 7.4.1727
Problem: Cannot detect a crash in tests when caused by garbagecollect().
Solution: Add garbagecollect_for_testing(). Do not free a job if is still
useful.
diff --git a/src/vim.h b/src/vim.h
index 36cc19a..9e2ab21 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1868,7 +1868,8 @@
#define VV_NULL 65
#define VV_NONE 66
#define VV_VIM_DID_ENTER 67
-#define VV_LEN 68 /* number of v: vars */
+#define VV_TESTING 68
+#define VV_LEN 69 /* number of v: vars */
/* used for v_number in VAR_SPECIAL */
#define VVAL_FALSE 0L