[llvm] [CodeGen] Use RegisterClassInfo for remaining allocation-order users (PR #216510)

[Nikhil Kotikalapudi via llvm-commits]

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@@ -804,6 +795,7 @@ bool RegAllocPBQP::runOnMachineFunction(MachineFunction &MF) {
       createInlineSpiller({LIS, LiveStks, MDT, MBFI}, MF, VRM, DefaultVRAI));
 
   MF.getRegInfo().freezeReservedRegs();
+  RCI.runOnMachineFunction(MF);
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nkotikal wrote:

@arsenm RA Base and by extension RA Greedy initializes with freezeReservedRegs, and RA Fast freezes in its runOnMachineFunction. I believe greedy, fast and base all use a local RCI as well, should all of these be converted?

https://github.com/llvm/llvm-project/pull/216510