RFR 8190800: Support for vectorization of sqrt float

[Lupusoru, Razvan A]

Hello,

The vectorizer cannot currently handle vectorization of sqrt for floats even though there is packed single precision sqrt instruction supported in AVX. The following patch rectifies the situation by adding a new C2 node for floating point version of Sqrt and its vectorized version, along with assembler support for it.
https://bugs.openjdk.java.net/browse/JDK-8190800

The proposed solution can be found here:
http://cr.openjdk.java.net/~rlupusoru/jdk_hs/webrev_sqrtf_02/

Please let me know if you have any questions or concerns.

--Razvan


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