[llvm] [RISCV][GlobalISel] Legalize and select G_PREFETCH (PR #215466)

[Craig Topper via llvm-commits]

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@@ -1694,6 +1799,89 @@ bool RISCVInstructionSelector::materializeImm(Register DstReg, int64_t Imm,
   return true;
 }
 
+InstructionSelector::ComplexRendererFns
+RISCVInstructionSelector::computeConstAddrPlan(int64_t CVal, bool IsPrefetch,
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topperc wrote:

Should this be named something like selectConstantAddr?

https://github.com/llvm/llvm-project/pull/215466