[clang] [Clang][NFC] Remove duplicated specialization of `llvm::DenseMapInfo<llvm::FoldingSetNodeID>` (PR #159718)

[Corentin Jabot via cfe-commits]

https://github.com/cor3ntin created https://github.com/llvm/llvm-project/pull/159718

In preparation of #141776

>From de3b12cc09c5d5302e0785c1431ff11650a9c9b6 Mon Sep 17 00:00:00 2001
From: Corentin Jabot <corentinjabot at gmail.com>
Date: Fri, 19 Sep 2025 10:12:17 +0200
Subject: [PATCH] [Clang][NFC] Remove duplicated specialization of
 `llvm::DenseMapInfo<llvm::FoldingSetNodeID>`

In preparation of #141776
---
 clang/include/clang/AST/ASTContext.h | 21 +++++++++++++++++++++
 clang/lib/AST/ASTContext.cpp         | 21 ---------------------
 clang/lib/Sema/SemaConcept.cpp       | 27 ---------------------------
 3 files changed, 21 insertions(+), 48 deletions(-)

diff --git a/clang/include/clang/AST/ASTContext.h b/clang/include/clang/AST/ASTContext.h
index b8f6de69bbb98..1bb9de70008b7 100644
--- a/clang/include/clang/AST/ASTContext.h
+++ b/clang/include/clang/AST/ASTContext.h
@@ -3843,4 +3843,25 @@ typename clang::LazyGenerationalUpdatePtr<Owner, T, Update>::ValueType
   return Value;
 }
 
+template <> struct llvm::DenseMapInfo<llvm::FoldingSetNodeID> {
+  static FoldingSetNodeID getEmptyKey() { return FoldingSetNodeID{}; }
+
+  static FoldingSetNodeID getTombstoneKey() {
+    FoldingSetNodeID ID;
+    for (size_t i = 0; i < sizeof(ID) / sizeof(unsigned); ++i) {
+      ID.AddInteger(std::numeric_limits<unsigned>::max());
+    }
+    return ID;
+  }
+
+  static unsigned getHashValue(const FoldingSetNodeID &Val) {
+    return Val.ComputeHash();
+  }
+
+  static bool isEqual(const FoldingSetNodeID &LHS,
+                      const FoldingSetNodeID &RHS) {
+    return LHS == RHS;
+  }
+};
+
 #endif // LLVM_CLANG_AST_ASTCONTEXT_H
diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index 5240054c2f36b..e49ff9080571e 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -114,27 +114,6 @@ enum FloatingRank {
   Ibm128Rank
 };
 
-template <> struct llvm::DenseMapInfo<llvm::FoldingSetNodeID> {
-  static FoldingSetNodeID getEmptyKey() { return FoldingSetNodeID{}; }
-
-  static FoldingSetNodeID getTombstoneKey() {
-    FoldingSetNodeID id;
-    for (size_t i = 0; i < sizeof(id) / sizeof(unsigned); ++i) {
-      id.AddInteger(std::numeric_limits<unsigned>::max());
-    }
-    return id;
-  }
-
-  static unsigned getHashValue(const FoldingSetNodeID &Val) {
-    return Val.ComputeHash();
-  }
-
-  static bool isEqual(const FoldingSetNodeID &LHS,
-                      const FoldingSetNodeID &RHS) {
-    return LHS == RHS;
-  }
-};
-
 /// \returns The locations that are relevant when searching for Doc comments
 /// related to \p D.
 static SmallVector<SourceLocation, 2>
diff --git a/clang/lib/Sema/SemaConcept.cpp b/clang/lib/Sema/SemaConcept.cpp
index f114173a42c21..d238b7916a330 100644
--- a/clang/lib/Sema/SemaConcept.cpp
+++ b/clang/lib/Sema/SemaConcept.cpp
@@ -1864,33 +1864,6 @@ NormalizedConstraint::getFoldExpandedConstraint() const {
 // ------------------------ Subsumption -----------------------------------
 //
 //
-
-template <> struct llvm::DenseMapInfo<llvm::FoldingSetNodeID> {
-
-  static FoldingSetNodeID getEmptyKey() {
-    FoldingSetNodeID ID;
-    ID.AddInteger(std::numeric_limits<unsigned>::max());
-    return ID;
-  }
-
-  static FoldingSetNodeID getTombstoneKey() {
-    FoldingSetNodeID ID;
-    for (unsigned I = 0; I < sizeof(ID) / sizeof(unsigned); ++I) {
-      ID.AddInteger(std::numeric_limits<unsigned>::max());
-    }
-    return ID;
-  }
-
-  static unsigned getHashValue(const FoldingSetNodeID &Val) {
-    return Val.ComputeHash();
-  }
-
-  static bool isEqual(const FoldingSetNodeID &LHS,
-                      const FoldingSetNodeID &RHS) {
-    return LHS == RHS;
-  }
-};
-
 SubsumptionChecker::SubsumptionChecker(Sema &SemaRef,
                                        SubsumptionCallable Callable)
     : SemaRef(SemaRef), Callable(Callable), NextID(1) {}