RFR: 8296638: RISC-V: Add T_SHORT/T_BYTE support for NegVI

[Dingli Zhang]

Hi,

NegVI also matches nodes with vector elements of T_SHORT/T_BYTE type, so it is necessary to add support for these two basic types in the instruct `vnegI`.
Meanwhile, I removed some useless trailing whitespace.

Please take a look and have some reviews. Thanks a lot.

## Testing:

- test/jdk/jdk/incubator/vector/* with fastdebug/release on qemu

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Commit messages:
 - remove some useless trailing whitespace
 - Add T_SHORT/T_BYTE support for NegVI

Changes: https://git.openjdk.org/jdk/pull/11074/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11074&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296638
  Stats: 12 lines in 1 file changed: 5 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/11074.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11074/head:pull/11074

PR: https://git.openjdk.org/jdk/pull/11074