This patch adds support for RISCV's vector extension RVV1.0.

Chip Kerchnerrequested to merge
RVV_Chip into master

This is an improved version of !1687 (closed) with additional bug fixes and GCC support.

This implements basic support for RVV1.0 as requested in #2842.

Co-authored-by:

Kseniya Zaytseva

@kseniya.zaytseva

PacketXh allow Packet operations with the FP16 type.

Since Eigen can only currently handle a set PacketSize and RVV is a variable sized vector (length agnostic), EIGEN_RISCV64_DEFAULT_LMUL is used to control the LMUL of a set PacketSize. Internally it will select the correctly sized PacketSize - example: PacketXi can be Packet1Xi, Packet2Xi or Packet4Xi.

Edited by Chip Kerchner

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