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cranelift: Add Bswap instruction (bytecodealliance#1092)
Adds Bswap to the Cranelift IR. Implements the Bswap instruction in the x64 and aarch64 codegen backends. Cranelift users can now: ``` builder.ins().bswap(value) ``` to get a native byteswap instruction. * x64: implements the 32- and 64-bit bswap instruction, following the pattern set by similar unary instrutions (Neg and Not) - it only operates on a dst register, but is parameterized with both a src and dst which are expected to be the same register. As x64 bswap instruction is only for 32- or 64-bit registers, the 16-bit swap is implemented as a rotate left by 8. * aarch64: Bswap gets emitted as aarch64 rev16, rev32, or rev64 instruction as appropriate. * s390x: Bswap not implemented * For completeness, added bswap to the interpreter as well.
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