Fix the definition of the vfork() builtin on Haiku.  PR14378.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@168674 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/TargetInfo.cpp b/lib/Basic/TargetInfo.cpp
index 3257526..83d4e2b 100644
--- a/lib/Basic/TargetInfo.cpp
+++ b/lib/Basic/TargetInfo.cpp
@@ -60,6 +60,7 @@
   Char32Type = UnsignedInt;
   Int64Type = SignedLongLong;
   SigAtomicType = SignedInt;
+  ProcessIDType = SignedInt;
   UseSignedCharForObjCBool = true;
   UseBitFieldTypeAlignment = true;
   UseZeroLengthBitfieldAlignment = false;