[clang] [Clang][Sema] Remove unused function after #88731 (PR #89618)

[Krystian Stasiowski via cfe-commits]

https://github.com/sdkrystian created https://github.com/llvm/llvm-project/pull/89618

Removes an unused static function `IsOverloaded` from `SemaOverload.cpp` that is unused after #88731.

>From b0dcd5b85d4945530abb8209d8069e5fca65eb72 Mon Sep 17 00:00:00 2001
From: Krystian Stasiowski <sdkrystian at gmail.com>
Date: Mon, 22 Apr 2024 11:57:18 -0400
Subject: [PATCH] [Clang][Sema] Remove unused function after 88731

---
 clang/lib/Sema/SemaOverload.cpp | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index a2763e331357fa..04cd9e78739d20 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -14261,12 +14261,6 @@ ExprResult Sema::BuildOverloadedCallExpr(Scope *S, Expr *Fn,
                                   OverloadResult, AllowTypoCorrection);
 }
 
-static bool IsOverloaded(const UnresolvedSetImpl &Functions) {
-  return Functions.size() > 1 ||
-         (Functions.size() == 1 &&
-          isa<FunctionTemplateDecl>((*Functions.begin())->getUnderlyingDecl()));
-}
-
 ExprResult Sema::CreateUnresolvedLookupExpr(CXXRecordDecl *NamingClass,
                                             NestedNameSpecifierLoc NNSLoc,
                                             DeclarationNameInfo DNI,