RFR: JDK-8302040: Port fdlibm sqrt to Java

[Joe Darcy]

On Thu, 23 Feb 2023 23:28:11 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> The wheel of FDLIBM porting turns a notch and sqrt comes into play.
> 
> While the sqrt operation usually has a hardware implementation that is intrinsified, for completeness a software implementation should be available as well.

src/java.base/share/classes/java/lang/StrictMath.java line 312:

> 310:      * @return  the positive square root of {@code a}.
> 311:      */
> 312:     // @IntrinsicCandidate -- Temporarily disable for testing

I'll revert commenting out the intrinsic annotation before pushing.

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PR: https://git.openjdk.org/jdk/pull/12736