SR-11889: Fixed code review issues

Author: kitaisreal

include/swift/Basic/Located.h

@@ -54,4 +54,33 @@ struct Located {
 
 } // end namespace swift
 
+namespace llvm {
+
+template <typename T> struct DenseMapInfo;
+
+template<typename T>
+struct DenseMapInfo<swift::Located<T>> {
+
+  static inline swift::Located<T> getEmptyKey() {
+    return swift::Located<T>(DenseMapInfo<T>::getEmptyKey(),
+                             DenseMapInfo<swift::SourceLoc>::getEmptyKey());
+  }
+
+  static inline swift::Located<T> getTombstoneKey() {
+    return swift::Located<T>(DenseMapInfo<T>::getTombstoneKey(),
+                             DenseMapInfo<swift::SourceLoc>::getTombstoneKey());
+  }
+
+  static unsigned getHashValue(const swift::Located<T> &LocatedVal) {
+    return combineHashValue(DenseMapInfo<T>::getHashValue(LocatedVal.Item),
+                            DenseMapInfo<swift::SourceLoc>::getHashValue(LocatedVal.Loc));
+  }
+
+  static bool isEqual(const swift::Located<T> &LHS, const swift::Located<T> &RHS) {
+    return DenseMapInfo<T>::isEqual(LHS.Item, RHS.Item) &&
+           DenseMapInfo<T>::isEqual(LHS.Loc, RHS.Loc);
+  }
+};
+} // namespace llvm
+
 #endif // SWIFT_BASIC_LOCATED_H

lib/ClangImporter/ImporterImpl.h

@@ -631,7 +631,7 @@ class LLVM_LIBRARY_VISIBILITY ClangImporter::Implementation
 public:
   /// Load a module using either method.
   ModuleDecl *loadModule(SourceLoc importLoc,
-                         ArrayRef<std::pair<Identifier, SourceLoc>> path);
+                         ArrayRef<Located<Identifier>> path);
 
   void recordImplicitUnwrapForDecl(ValueDecl *decl, bool isIUO) {
     if (!isIUO)