[libfuzzer] chromium-related compilation fixes

Reviewers: kcc

Differential Revision: https://reviews.llvm.org/D29502

llvm-svn: 294035
diff --git a/llvm/lib/Fuzzer/FuzzerShmemPosix.cpp b/llvm/lib/Fuzzer/FuzzerShmemPosix.cpp
index b727c24..2723bdd 100644
--- a/llvm/lib/Fuzzer/FuzzerShmemPosix.cpp
+++ b/llvm/lib/Fuzzer/FuzzerShmemPosix.cpp
@@ -21,6 +21,7 @@
 #include <sys/mman.h>
 #include <semaphore.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 
 namespace fuzzer {