Commits on Oct 31, 2022

1. 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.
   
   Updated x64 RexFlags type to support emitting for single-operand
   instructions like bswap
   
   * aarch64: Bswap gets emitted as aarch64 rev16, rev32,
   or rev64 instruction as appropriate.
   
   * s390x: Bswap was already supported in backend, just had to add
   a bit of plumbing
   
   * For completeness, added bswap to the interpreter as well.
   
   * added filetests and runtests for each ISA
   
   * added bswap to fuzzgen, thanks to afonso360 for the code there
   
   * 128-bit swaps are not yet implemented, that can be done later

   

   11evan committed Oct 31, 2022
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