message: Remove incorrect comment -- wasmer does support mutable globals.
  The reason this test needed to be disabled is correctly documented in the comment above.
diff: ;; wasmer silently doesn't implement (register) yet
  ;;(module $M
  ;; (global (export "a") v128 (v128.const f32x4 0.0 1.0 2.0 3.0))
  -;; Wasmer does not yet support mutable global variables.
  ;; (global (export "b") (mut v128) (v128.const f32x4 4.0 5.0 6.0 7.0))
  ;;)
  ;;(register "M" $M)
  