PPC/s390: [codegen] Change RegList into a class
Port 8a0d1b6f Original Commit Message: Modernise the RegList interface to be a proper class, rather than a typedef to an integer, and add proper methods onto it rather than ad-hoc bit manipulation. In particular, this makes RegList typesafe, adding a DoubleRegList for DoubleRegisters. The Arm64 CPURegList isn't updated to use (or extend) the new RegList interface, because of its weird type-erasing semantics (it can store Registers and VRegisters). Maybe in the future we'll want to get rid of CPURegList entirely and use RegList/DoubleRegList directly. R=leszeks@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com BUG= LOG=N Change-Id: I997156fe4f4f2ccc40b2631d5cb752efdc8a5ad2 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3525084Reviewed-by:Junliang Yan <junyan@redhat.com> Commit-Queue: Milad Farazmand <mfarazma@redhat.com> Cr-Commit-Position: refs/heads/main@{#79484}
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