This patch provides the bottom layer of the ARM64 backend: it defines
the `Inst` type, which represents a single machine instruction, and
defines emission routines to produce machine code from a `VCode`
container of `Insts`. The backend cannot produce `Inst`s with just this
patch; that will come with later parts.
This patch contains code written by Julian Seward <jseward@acm.org> and
Benjamin Bouvier <public@benj.me>, originally developed on a side-branch
before rebasing and condensing into this patch series. See the `arm64`
branch at `https://github.com/cfallin/wasmtime` for original development
history.
This patch also contains code written by Joey Gouly
<joey.gouly@arm.com> and contributed to the above branch. These
contributions are "Copyright (c) 2020, Arm Limited."
Finally, a contribution from Joey Gouly contains the following notice:
This is a port of VIXL's Assembler::IsImmLogical.
Arm has the original copyright on the VIXL code this was ported from
and is relicensing it under Apache 2 for Cranelift.
Co-authored-by: Julian Seward <jseward@acm.org>
Co-authored-by: Benjamin Bouvier <public@benj.me>
Co-authored-by: Joey Gouly <joey.gouly@arm.com>
