RFR: make FieldLayout#data() public

[Aleksey Shipilev]

On Wed, 10 Nov 2021 08:04:41 GMT, Ivan Ponomarev <duke at openjdk.java.net> wrote:

> > Maybe it would be better to provide the specific accessor
> 
> Added accessors for field's value and the `Field` itself. The reason why `value` alone is not enough: we want exact field's type information.

There is already `typeClass()`. Do you actually need `Class<?>` out of it? I am not sure that one is always accessible.

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PR: https://git.openjdk.java.net/jol/pull/19