Return only the least significant 8 bits of the exit status from

Process::Wait on Windows (mimicing POSIX behaviour).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143876 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/Windows/Program.inc

@@ -367,7 +367,7 @@ Program::Wait(const Path &path,
     return -2;
   }
 
-  return status;
+  return status & 0377;
 }
 
 bool