[libFuzzer] reinstate -dump_coverage, which is still in use (reverts r332036)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer@332876 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/FuzzerDriver.cpp b/FuzzerDriver.cpp
index 26e5548..dfb3d49 100644
--- a/FuzzerDriver.cpp
+++ b/FuzzerDriver.cpp
@@ -615,6 +615,7 @@
   Options.PrintFinalStats = Flags.print_final_stats;
   Options.PrintCorpusStats = Flags.print_corpus_stats;
   Options.PrintCoverage = Flags.print_coverage;
+  Options.DumpCoverage = Flags.dump_coverage;
   Options.UseFeatureFrequency = Flags.use_feature_frequency;
   if (Flags.exit_on_src_pos)
     Options.ExitOnSrcPos = Flags.exit_on_src_pos;