RFR: 8247912: Make narrowOop a scoped enum [v2]

[Matthias Baesken]

On Mon, 21 Sep 2020 21:29:41 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Kim Barrett has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - improve assertion
>>  - remove NarrowType
>
> This looks good overall to me.

Our nightly builds+tests  on linux ppc64(le) with your change included looked good,  seems your change did not cause
any harm.  My local  build on linux s390x with your patch included  worked nicely too, some small  smoke tests were
okay as well .

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PR: https://git.openjdk.java.net/jdk/pull/273