[llvm] [RISCV] Convert LWU to LW if possible in RISCVOptWInstrs (PR #144703)

[Craig Topper via llvm-commits]

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@@ -808,5 +831,7 @@ bool RISCVOptWInstrs::runOnMachineFunction(MachineFunction &MF) {
   if (ST.preferWInst())
     MadeChange |= appendWSuffixes(MF, TII, ST, MRI);
 
+  MadeChange |= convertZExtLoads(MF, TII, ST, MRI);
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topperc wrote:

Can we combine stripWSuffixes/appendWSuffixes/convertZExtLoads into a single function that walks over the function once and does the right thing?

https://github.com/llvm/llvm-project/pull/144703