[AMDGPU] Speed up SIRegisterInfo::getReservedRegs (#79844) reserveRegisterTuples is slow because it uses MCRegAliasIterator and hence ends up reserving the same aliased registers many times. This patch changes getReservedRegs not to use it for reserving SGPRs, VGPRs and AGPRs. Instead it iterates through base register classes, which should come closer to reserving each register once only. Overall this speeds up the time to run check-llvm-codegen-amdgpu in my Release build from 18.4 seconds to 16.9 seconds (all timings +/- 0.2).
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