1. [RISCV] Define vmerge/vfmerge intrinsics. (details)
Commit 032600b9aef9dafe62fda6e880b5c1b0a87e4364 by zakk.chen
[RISCV] Define vmerge/vfmerge intrinsics.

Define vmerge/vfmerge intrinsics and lower to V instructions.

Include support for vector-vector vfmerge by vmerge.vvm.

We work with @rogfer01 from BSC to come out this patch.

Reviewed By: craig.topper

Differential Revision:
The file was modifiedllvm/include/llvm/IR/
The file was modifiedllvm/lib/Target/RISCV/
The file was addedllvm/test/CodeGen/RISCV/rvv/vmerge-rv32.ll
The file was addedllvm/test/CodeGen/RISCV/rvv/vmerge-rv64.ll
The file was addedllvm/test/CodeGen/RISCV/rvv/vfmerge-rv64.ll
The file was addedllvm/test/CodeGen/RISCV/rvv/vfmerge-rv32.ll