[llvm] [RISCV] Add searchable table for tune information (PR #66193)

[Craig Topper via llvm-commits]

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@@ -65,6 +71,11 @@ RISCVSubtarget::initializeSubtargetDependencies(const Triple &TT, StringRef CPU,
   if (TuneCPU.empty())
     TuneCPU = CPU;
 
+  TuneInfo = RISCVTuneInfoTable::getRISCVTuneInfo(TuneCPU);
+  // If there is no TuneInfo for this CPU, we fail back to generic.
+  if (!TuneInfo)
+    TuneInfo = RISCVTuneInfoTable::getRISCVTuneInfo("generic");
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topperc wrote:

assert than `TuneInfo` isn't null for "generic"?

https://github.com/llvm/llvm-project/pull/66193