[CodeComplete] Report location of opening parens for signature help

Summary: Used in clangd.

Reviewers: sammccall

Reviewed By: sammccall

Subscribers: ioeric, kadircet, cfe-commits

Differential Revision: https://reviews.llvm.org/D51436

llvm-svn: 341063
diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index 701f07f..b91870c 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -1911,8 +1911,10 @@
 
     void ProcessOverloadCandidates(Sema &S, unsigned CurrentArg,
                                    OverloadCandidate *Candidates,
-                                   unsigned NumCandidates) override {
-      Next.ProcessOverloadCandidates(S, CurrentArg, Candidates, NumCandidates);
+                                   unsigned NumCandidates,
+                                   SourceLocation OpenParLoc) override {
+      Next.ProcessOverloadCandidates(S, CurrentArg, Candidates, NumCandidates,
+                                     OpenParLoc);
     }
 
     CodeCompletionAllocator &getAllocator() override {