[libFuzzer] call __sanitizer_dump_coverage via  EF

llvm-svn: 292681
diff --git a/llvm/lib/Fuzzer/FuzzerExtFunctions.def b/llvm/lib/Fuzzer/FuzzerExtFunctions.def
index 61c72e4..91c9b07 100644
--- a/llvm/lib/Fuzzer/FuzzerExtFunctions.def
+++ b/llvm/lib/Fuzzer/FuzzerExtFunctions.def
@@ -48,3 +48,5 @@
 EXT_FUNC(__sanitizer_set_report_fd, void, (void*), false);
 EXT_FUNC(__sanitizer_update_counter_bitset_and_clear_counters, uintptr_t,
   (uint8_t*), false);
+EXT_FUNC(__sanitizer_dump_coverage, void, (const uintptr_t *, uintptr_t),
+         false);