MethodParameters attributes in v51 classfiles

[Liam Miller-Cushon]

If -parameters is passed, javac will write MethodParameters attributes when
source/target < 8. It also reports -Xlint:classfile warnings about
MethodParameters attributes in < v52 classfiles:

class X {
  void f(int a) {}
}
class Y {
  X x;
}

$ javac -source 7 -target 7 -parameters X.java
$ javac -Xlint:classfile -sourcepath : Y.java
./X.class: warning: [classfile] MethodParameters attribute introduced in
version 52.0 class files is ignored in version 51.0 class files

Is that deliberate? I expected it to either not write the attribute for old
classfile versions, or not warn about it.
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