[clangd] Add std::move() to a return statement to please some compilers.

This has been causing build errors in Swift CI.

Differential Revision: https://reviews.llvm.org/D81079

diff --git a/clang-tools-extra/clangd/index/FileIndex.cpp b/clang-tools-extra/clangd/index/FileIndex.cpp
index 79ec112..1a18af1 100644 (file)
--- a/clang-tools-extra/clangd/index/FileIndex.cpp
+++ b/clang-tools-extra/clangd/index/FileIndex.cpp
@@ -201,7 +201,8 @@ FileShardedIndex::getShard(llvm::StringRef Uri) const {
     RelB.insert(*Rel);
   }
   IF.Relations = std::move(RelB).build();
-  return IF;
+  // Explicit move here is needed by some compilers.
+  return std::move(IF);
 }
 
 SlabTuple indexMainDecls(ParsedAST &AST) {