diff --git a/llvm/lib/Support/CrashRecoveryContext.cpp b/llvm/lib/Support/CrashRecoveryContext.cpp
index 77f00189274f..3d3ca7f567c7 100644
--- a/llvm/lib/Support/CrashRecoveryContext.cpp
+++ b/llvm/lib/Support/CrashRecoveryContext.cpp
@@ -454,6 +454,7 @@ bool CrashRecoveryContext::throwIfCrash(int RetCode) {
   ::RaiseException(RetCode, 0, 0, NULL);
 #else
   // On Unix, signals are represented by return codes of 128 or higher.
+  // Exit code 128 is a reserved value and should not be raised as a signal.
   if (RetCode <= 128)
     return false;
   llvm::sys::unregisterHandlers();
diff --git a/llvm/lib/Support/Process.cpp b/llvm/lib/Support/Process.cpp
index 8626117f2a0b..e0814444876c 100644
--- a/llvm/lib/Support/Process.cpp
+++ b/llvm/lib/Support/Process.cpp
@@ -20,7 +20,7 @@
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Program.h"
 
-#include <stddef.h> // for _Exit
+#include <stdlib.h> // for _Exit
 
 using namespace llvm;
 using namespace sys;