RFR: 8272861: Add a micro benchmark for vector api [v4]

[Sandhya Viswanathan]

> This pull request adds a micro benchmark for Vector API.
> The Black Scholes algorithm is implemented with and without Vector API.
> We see about ~6x gain with Vector API for this micro benchmark using 256 bit vectors.

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

  No need to normalize nextFloat

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5234/files
  - new: https://git.openjdk.java.net/jdk/pull/5234/files/5b4abbf9..df22def3

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5234&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5234&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5234.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5234/head:pull/5234

PR: https://git.openjdk.java.net/jdk/pull/5234