Hole fits: Don't suggest trivial infinite recursion

[anka-213]

It would be nice if hole fits wouldn't suggest trivial infinite recursion.

If I write the code

foobar :: Foo -> Bar
foobar = _

I would almost never want the definition

foobar :: Foo -> Bar
foobar = foobar

Currently, this is the first suggestion it gives.

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Originally posted by @anka-213 in #883 (comment)

[July541]

I think to make this the lowest priority is a good choice.

[rowanG077]

Are there any cases where this is actually the code you want? I would rather have that it never suggest this.