[clang] [llvm] [RISCV] Deduplicate RISCVISAInfo::toFeatures/toFeatureVector. NFC (PR #76942)

[Craig Topper via cfe-commits]

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@@ -42,9 +42,9 @@ static bool getArchFeatures(const Driver &D, StringRef Arch,
     return false;
   }
 
-  (*ISAInfo)->toFeatures(
-      Features, [&Args](const Twine &Str) { return Args.MakeArgString(Str); },
-      /*AddAllExtensions=*/true);
+  for (std::string &Str : (*ISAInfo)->toFeatures(/*AddAllExtension=*/true,
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topperc wrote:

const reference?

https://github.com/llvm/llvm-project/pull/76942