[clang] [clang] Implement P2582R1: CTAD from inherited constructors (PR #98788)

[via cfe-commits]

================
@@ -10616,6 +10616,43 @@ bool clang::isBetterOverloadCandidate(
     auto *Guide1 = dyn_cast_or_null<CXXDeductionGuideDecl>(Cand1.Function);
     auto *Guide2 = dyn_cast_or_null<CXXDeductionGuideDecl>(Cand2.Function);
     if (Guide1 && Guide2) {
+      //  -- F1 and F2 are generated from class template argument deduction
+      //  for a class D, and F2 is generated from inheriting constructors
+      //  from a base class of D while F1 is not, ...
+      bool G1Inherited =
+          Guide1->getSourceDeductionGuide() &&
+          Guide1->getSourceKind() ==
+              CXXDeductionGuideDecl::SourceKind::InheritedConstructor;
+      bool G2Inherited =
+          Guide2->getSourceDeductionGuide() &&
+          Guide2->getSourceKind() ==
+              CXXDeductionGuideDecl::SourceKind::InheritedConstructor;
+      if (Guide1->isImplicit() && Guide2->isImplicit() &&
+          G1Inherited != G2Inherited) {
+        const FunctionProtoType *FPT1 =
+            Guide1->getType()->getAs<FunctionProtoType>();
+        const FunctionProtoType *FPT2 =
+            Guide2->getType()->getAs<FunctionProtoType>();
+        assert(FPT1 && FPT2);
+
+        // ... and for each explicit function argument, the parameters of F1 and
+        // F2 are either both ellipses or have the same type
+        if (FPT1->isVariadic() == FPT2->isVariadic() &&
+            FPT1->getNumParams() == FPT2->getNumParams()) {
+          const auto &P1 = FPT1->getParamTypes();
+          const auto &P2 = FPT2->getParamTypes();
+          bool ParamsHaveSameType = llvm::all_of(
+              llvm::zip(P1, P2),
----------------
cor3ntin wrote:

We apparently have `all_of_zip`

https://github.com/llvm/llvm-project/pull/98788