Avoid non-windows non-linux in assembly x64 test

Author: scottmcm

tests/assembly/x86_64-typed-swap.rs

@@ -1,3 +1,6 @@
+//@ revisions: WIN LIN
+//@ [WIN] only-windows
+//@ [LIN] only-linux
 //@ only-x86_64
 //@ assembly-output: emit-asm
 //@ compile-flags: --crate-type=lib -O