Commits on Jun 27, 2022

1. x64: Fix codegen for the i8x16.swizzle instruction (bytecodeallianc… …

   …e#4318)
   
   This commit fixes a mistake in the `Swizzle` opcode implementation in
   the x64 backend of Cranelift. Previously an input register was casted to
   a writable register and then modified, which I believe instructions are
   not supposed to do. This was discovered as part of my investigation
   into bytecodealliance#4315.

   

   alexcrichton committed Jun 27, 2022
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2. x64: Fix codegen for the select instruction with v128 (bytecodealli… …

   …ance#4317)
   
   This commit fixes a bug in the previous codegen for the `select`
   instruction when the operations of the `select` were of the `v128` type.
   Previously teh `XmmCmove` instruction only stored an `OperandSize` of 32
   or 64 for a 64 or 32-bit move, but this was also used for these 128-bit
   types which meant that when used the wrong move instruction was
   generated. The fix applied here is to store the whole `Type` being moved
   so the 128-bit variant can be selected as well.

   

   alexcrichton committed Jun 27, 2022
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