add some newlines at the end of files to avoid "dangerous" implementation

defined behavior in C++98.  I thought that C++'11 fixed this though, so it
isn't clear why clang is complaining about it.

Author: lattner

include/swift/Remote/CMemoryReader.h

@@ -75,4 +75,4 @@ class CMemoryReader final : public MemoryReader {
 }
 }
 
-#endif
+#endif

include/swift/Remote/InProcessMemoryReader.h

@@ -55,4 +55,4 @@ class InProcessMemoryReader final : public MemoryReader {
 }
 }
 
-#endif
+#endif

lib/IRGen/GenBuiltin.cpp

@@ -854,4 +854,4 @@ if (Builtin.ID == BuiltinValueKind::id) { \
   }
 
   llvm_unreachable("IRGen unimplemented for this builtin!");
-}
+}