[libFuzzer] call __sanitizer_dump_coverage via  EF

llvm-svn: 292681
diff --git a/llvm/lib/Fuzzer/FuzzerTracePC.cpp b/llvm/lib/Fuzzer/FuzzerTracePC.cpp
index 6b31808..1cbb00a 100644
--- a/llvm/lib/Fuzzer/FuzzerTracePC.cpp
+++ b/llvm/lib/Fuzzer/FuzzerTracePC.cpp
@@ -197,7 +197,8 @@
 }
 
 void TracePC::DumpCoverage() {
-  __sanitizer_dump_coverage(PCs, GetNumPCs());
+  if (EF->__sanitizer_dump_coverage)
+    EF->__sanitizer_dump_coverage(PCs, GetNumPCs());
 }
 
 // Value profile.