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G_INSERT and G_EXTRACT are not sufficient to use to represent both
INSERT/EXTRACT on a subregister and INSERT/EXTRACT on a vector.
We would like to be able to INSERT/EXTRACT on vectors in cases that
INSERT/EXTRACT on vector subregisters are not sufficient, so we add
these opcodes.
I tried to do a patch where we treated G_EXTRACT as both
G_EXTRACT_SUBVECTOR and G_EXTRACT_SUBREG, but ran into an infinite loop
at this
[point](8b5b294ec2/llvm/lib/Target/RISCV/RISCVISelLowering.cpp (L9932))
in the SDAG equivalent code.
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