Finish mips64el #1
Description
@jcowgill I have here a branch (mips64el) that adds mips64 and msa support for stdsimd.
The only thing missing is getting CI working.
I am using qemu-mips64 -cpu I6400 / qemu-mips64el -cpu I6400 (see the Dockerfiles in stdsimd/ci/docker) as the cargo test runner and compiling the code with: -C target-cpu=mips64r6.
But I am getting some errors cross-compiling some of the crates for that architecture.