[libFuzzer] Fix sizeof(ptr) bug.

sizeof(const char *) returns 4 or 8 when what we really want is the size
of the array.

llvm-svn: 323802
diff --git a/compiler-rt/lib/fuzzer/FuzzerMutate.cpp b/compiler-rt/lib/fuzzer/FuzzerMutate.cpp
index 9ee5299..e0e4578 100644
--- a/compiler-rt/lib/fuzzer/FuzzerMutate.cpp
+++ b/compiler-rt/lib/fuzzer/FuzzerMutate.cpp
@@ -62,7 +62,7 @@
 
 static char RandCh(Random &Rand) {
   if (Rand.RandBool()) return Rand(256);
-  const char *Special = "!*'();:@&=+$,/?%#[]012Az-`~.\xff\x00";
+  const char Special[] = "!*'();:@&=+$,/?%#[]012Az-`~.\xff\x00";
   return Special[Rand(sizeof(Special) - 1)];
 }