[compiler-rt] Fix reporting unrecognized flags in unit tests.

Previously, the warning messages might be issued within a wrong test case.

Differential Revision: https://reviews.llvm.org/D57318

llvm-svn: 352447

compiler-rt/lib/sanitizer_common/tests/sanitizer_flags_test.cc

@@ -33,6 +33,9 @@ static void TestFlag(T start_value, const char *env, T final_value) {
   parser.ParseString(env);
 
   EXPECT_EQ(final_value, flag);
+
+  // Reporting unrecognized flags is needed to reset them.
+  ReportUnrecognizedFlags();
 }
 
 template <>