S390 [simd]: cleanup the instruction selector
This CL includes the following changes: - Avoid using `UniqueRegister` as much as possible - Try to group opcodes under Binary or Unary when possible Separate selectors are added to use `UniqueRegister` when necessary mainly when `Temp` registers are used. This is to make sure temp, dst and src registers are allocated differently and cannot be overwritten during codegen. Some codegen ops had to also be modified to avoid using `Temp` registers. Change-Id: I4d5bdec58cb4874e7c3d344091cde8c8a9a4d01b Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3024149Reviewed-by: Junliang Yan <junyan@redhat.com> Commit-Queue: Milad Fa <mfarazma@redhat.com> Cr-Commit-Position: refs/heads/master@{#75723}
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