RFR: 8256585: Remove in-place conversion vector operators from Vector API

[Paul Sandoz]

On Thu, 19 Nov 2020 03:26:20 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

> Remove partially implemented in-place conversion vector operators from Vector API:
>    ofNarrowing, ofWidening, INPLACE_XXX

The documentation `Vector.convert` and `Vector.convertShape` needs to be updated to remove specification of in-place conversions, as does the class documentation on `Vector`. A search for the term `in-place` should find the relevant locations.

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Changes requested by psandoz (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1305