[clang] [llvm] [RISCV] Add sifive-p470 processor (PR #102022)

[Craig Topper via cfe-commits]

================
@@ -266,11 +272,47 @@ def SIFIVE_P450 : RISCVProcessorModel<"sifive-p450", 
SiFiveP400Model,
                                        FeatureStdExtZfhmin,
                                        FeatureUnalignedScalarMem,
                                        FeatureUnalignedVectorMem],
-                                      [TuneNoDefaultUnroll,
-                                       TuneConditionalCompressedMoveFusion,
-                                       TuneLUIADDIFusion,
-                                       TuneAUIPCADDIFusion,
-                                       FeaturePostRAScheduler]>;
+                                      SiFiveP400TuneFeatures>;
+
+def SIFIVE_P470 : RISCVProcessorModel<"sifive-p470", SiFiveP400Model,
----------------
topperc wrote:

What's the benefit of adding supervisor extensions? They aren't useable from 
applications. It just makes the ELF attribute very long.

https://github.com/llvm/llvm-project/pull/102022
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