RFR: 8279651: [vectorapi] Implement the missing intrinsics for casting from integrals on x64 [v2]

[Quan Anh Mai]

> Hi,
> 
> This patch implements the remaining casts from integral types on x64.
> 
> Thank you very much.

Quan Anh Mai has updated the pull request incrementally with one additional commit since the last revision:

  x86_32 implementation of vcastLtoFD

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7002/files
  - new: https://git.openjdk.java.net/jdk/pull/7002/files/fe2d8aca..db8bb5d1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7002&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7002&range=00-01

  Stats: 71 lines in 3 files changed: 54 ins; 15 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7002.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7002/head:pull/7002

PR: https://git.openjdk.java.net/jdk/pull/7002