[libFuzzer] Add Fuzzer to the list of sanitizers which support coverage.

Without this change, additional coverage flags specified after
-fsanitize=fuzzer would get discarded.

https://reviews.llvm.org/D34794

llvm-svn: 306734
diff --git a/clang/lib/Driver/SanitizerArgs.cpp b/clang/lib/Driver/SanitizerArgs.cpp
index 3a30f2a..7a442c83 100644
--- a/clang/lib/Driver/SanitizerArgs.cpp
+++ b/clang/lib/Driver/SanitizerArgs.cpp
@@ -32,7 +32,7 @@
   RequiresPIE = DataFlow,
   NeedsUnwindTables = Address | Thread | Memory | DataFlow,
   SupportsCoverage = Address | KernelAddress | Memory | Leak | Undefined |
-                     Integer | Nullability | DataFlow,
+                     Integer | Nullability | DataFlow | Fuzzer,
   RecoverableByDefault = Undefined | Integer | Nullability,
   Unrecoverable = Unreachable | Return,
   LegacyFsanitizeRecoverMask = Undefined | Integer,