[fuzzer] move default sanitizer options to a separate file

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228429 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Fuzzer/FuzzerMain.cpp

@@ -18,13 +18,6 @@
 #include <atomic>
 #include <mutex>
 
-// ASAN options:
-//   * don't dump the coverage to disk.
-//   * enable coverage by default.
-extern "C" const char *__asan_default_options() {
-  return "coverage_pcs=0:coverage=1";
-}
-
 // Program arguments.
 struct FlagDescription {
   const char *Name;