patch 8.1.1684: profiling functionality is spread out

Problem:    Profiling functionality is spread out.
Solution:   Put profiling functionality in profiling.c. (Yegappan Lakshmanan,
            closes #4666)
diff --git a/Filelist b/Filelist
index ff40389..6e90d21 100644
--- a/Filelist
+++ b/Filelist
@@ -80,6 +80,7 @@
 		src/option.h \
 		src/popupmnu.c \
 		src/popupwin.c \
+		src/profiler.c \
 		src/quickfix.c \
 		src/regexp.c \
 		src/regexp_nfa.c \