RFR: 8256585: Remove in-place conversion vector operators from Vector API [v2]

[Sandhya Viswanathan]

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

Sandhya Viswanathan has updated the pull request incrementally with one additional commit since the last revision:

  Update documentation

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1305/files
  - new: https://git.openjdk.java.net/jdk/pull/1305/files/73122deb..db9d37de

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1305&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1305&range=00-01

  Stats: 12 lines in 1 file changed: 0 ins; 12 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1305.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1305/head:pull/1305

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