[clang] [RISCV] Overwrite cpu target features for full arch string in target attribute (PR #77426)

[Craig Topper via cfe-commits]

================
@@ -281,10 +248,28 @@ bool RISCVTargetInfo::initFeatureMap(
     Features["32bit"] = true;
   }
 
-  std::vector<std::string> NewFeaturesVec =
-      resolveTargetAttrOverride(FeaturesVec, XLen);
+  // If a target attribute specified a full arch string, override all the ISA
+  // extension target features.
+  const auto I = llvm::find(FeaturesVec, "__RISCV_TargetAttrNeedOverride");
+  if (I != FeaturesVec.end()) {
+    std::vector<std::string> OverrideFeatures =
----------------
topperc wrote:

`std::vector<std::string> OverrideFeatures(std::next(I), FeaturesVec.end());`

https://github.com/llvm/llvm-project/pull/77426
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