[ELF] - Add a test for --no-warn-symbol-ordering.

Mentioned flag was never tested together with
--call-graph-ordering-file. And the following line
was uncovered:

https://github.com/llvm-mirror/lld/blob/master/ELF/Symbols.cpp#L248

llvm-svn: 337266

lld/test/ELF/cgprofile-warn.s

@@ -29,3 +29,8 @@ A:
 # CHECK: {{.*}}.call_graph: no such symbol: adena1
 # CHECK: {{.*}}.call_graph: no such symbol: adena2
 # CHECK: unable to order undefined symbol: poppy
+
+# RUN: ld.lld %t --call-graph-ordering-file %t.call_graph -o /dev/null \
+# RUN:   -noinhibit-exec -icf=all --no-warn-symbol-ordering 2>&1 \
+# RUN:   | FileCheck %s --check-prefix=NOWARN
+# NOWARN-NOT: unable to order