[clang] [llvm] [Reland] [PowerPC] frontend get target feature from backend with cpu name (PR #144594)

[Sam Elliott via llvm-commits]

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@@ -190,6 +192,31 @@ insertWaveSizeFeature(StringRef GPU, const Triple &T,
                       StringMap<bool> &Features);
 
 } // namespace AMDGPU
+
+struct BasicSubtargetFeatureKV {
+  const char *Key;         ///< K-V key string
+  unsigned Value;          ///< K-V integer value
+  FeatureBitArray Implies; ///< K-V bit mask
+};
+
+/// Used to provide key value pairs for feature and CPU bit flags.
+struct BasicSubtargetSubTypeKV {
+  const char *Key;         ///< K-V key string
+  FeatureBitArray Implies; ///< K-V bit mask
+
+  /// Compare routine for std::lower_bound
+  bool operator<(StringRef S) const { return StringRef(Key) < S; }
+
+  /// Compare routine for std::is_sorted.
+  bool operator<(const BasicSubtargetSubTypeKV &Other) const {
+    return StringRef(Key) < StringRef(Other.Key);
+  }
+};
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lenary wrote:

Given this is a reland, sure, I'm happy for you to do this refactor later.

https://github.com/llvm/llvm-project/pull/144594