Use LLVM version of combineHashValue

This fixes the master-next build.

Author: MForster

include/swift/AST/SourceFile.h

@@ -734,9 +734,11 @@ struct DenseMapInfo<swift::SourceFile::ImportedModuleDesc> {
                               StringRefDMI::getTombstoneKey());
   }
   static inline unsigned getHashValue(const ImportedModuleDesc &import) {
-    return combineHashValue(ImportedModuleDMI::getHashValue(import.module),
-           combineHashValue(ImportOptionsDMI::getHashValue(import.importOptions),
-                            StringRefDMI::getHashValue(import.filename)));
+    return detail::combineHashValue(
+        ImportedModuleDMI::getHashValue(import.module),
+        detail::combineHashValue(
+            ImportOptionsDMI::getHashValue(import.importOptions),
+            StringRefDMI::getHashValue(import.filename)));
   }
   static bool isEqual(const ImportedModuleDesc &a,
                       const ImportedModuleDesc &b) {

lib/IRGen/LocalTypeDataKind.h

@@ -211,8 +211,8 @@ template <> struct DenseMapInfo<swift::irgen::LocalTypeDataKey> {
              swift::irgen::LocalTypeDataKind::forFormalTypeMetadata() };
   }
   static unsigned getHashValue(const LocalTypeDataKey &key) {
-    return combineHashValue(CanTypeInfo::getHashValue(key.Type),
-                            key.Kind.getRawValue());
+    return detail::combineHashValue(CanTypeInfo::getHashValue(key.Type),
+                                    key.Kind.getRawValue());
   }
   static bool isEqual(const LocalTypeDataKey &a, const LocalTypeDataKey &b) {
     return a == b;