[CodeGen] [ARM] Make RISC-V Init Undef Pass Target Independent and add support for the ARM Architecture. (#77770) When using Greedy Register Allocation, there are times where early-clobber values are ignored, and assigned the same register. This is illeagal behaviour for these intructions. To get around this, using Pseudo instructions for early-clobber registers gives them a definition and allows Greedy to assign them to a different register. This then meets the ARM Architecture Reference Manual and matches the defined behaviour. This patch takes the existing RISC-V patch and makes it target independent, then adds support for the ARM Architecture. Doing this will ensure early-clobber restraints are followed when using the ARM Architecture. Making the pass target independent will also open up possibility that support other architectures can be added in the future.
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