[clang] [Basic] Avoid repeated hash lookups (NFC) (PR #111228)

[Kazu Hirata via cfe-commits]

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@@ -92,11 +92,10 @@ parseTargetIDWithFormatCheckingOnly(llvm::StringRef TargetID,
     if (Sign != '+' && Sign != '-')
       return std::nullopt;
     bool IsOn = Sign == '+';
-    auto Loc = FeatureMap->find(Feature);
+    auto [Loc, Inserted] = FeatureMap->try_emplace(Feature, IsOn);
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kazutakahirata wrote:

Thank you for pointing this out!

https://github.com/llvm/llvm-project/pull/111228