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

In preparation of #141776

Author: cor3ntin

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

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>

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) {}