Re-xfail extern-pass-TwoU{8,16}.rs (still doesn't work on 32-bit platforms).

Author: huonw

src/test/run-pass/extern-pass-TwoU16s.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// xfail-test #5744 fails on 32 bit
+
 // Test a foreign function that accepts and returns a struct
 // by value.
 

src/test/run-pass/extern-pass-TwoU8s.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// xfail-test #5744 fails on 32 bit
+
 // Test a foreign function that accepts and returns a struct
 // by value.