Implement all ARM NEON intrinsics

Steps for implementing an intrinsic:

• Select an intrinsic below
• Review coresimd/arm/neon.rs and coresimd/aarch64/neon.rs
• Consult ARM official documentation about your intrinsic
• Consult godbolt for how the intrinsic should be codegen'd, using clang as an example. Use the links below and replace the name of the intrinsic in the code with your intrinsic. Note that if ARM is an error then your intrinsic may be AArch64-only
  • ARM
  • AArch64
• If the codegen is the same on ARM/AArch64, place the intrinsic in coresimd/arm/neon.rs. If it's different place it in both with appropriate #[cfg] in coresimd/arm/neon.rs. If it's only AArch64 place it in coresimd/aarch64/neon.rs
• Write a test for your intrinsic at the bottom of the file as well
• Test! Probably use rustup run nightly sh ci/run-docker.sh aarch64-unknown-linux-gnu.
• When ready, send a PR!

All unimplemented NEON intrinsics

Select one intrinsic from the linked list, then review coresimd/arm/neon.rs and coresimd/aarch64/neon.rs. Consult the ARM documentation and the linked Godbolt examples to determine placement and code generation, add a test at the bottom of the relevant file, and run rustup run nightly sh ci/run-docker.sh aarch64-unknown-linux-gnu. Done means the selected intrinsic is implemented and tested.