[llvm] [TextAPI] Use function_ref where possible, NFCI (PR #76732)

[Cyndy Ishida via llvm-commits]

https://github.com/cyndyishida created https://github.com/llvm/llvm-project/pull/76732

None

>From 109f17508fbe173306c92152d995d6a9ccbcd729 Mon Sep 17 00:00:00 2001
From: Cyndy Ishida <cyndy_ishida at apple.com>
Date: Tue, 2 Jan 2024 08:18:01 -0800
Subject: [PATCH] [TextAPI] Use function_ref where possible, NFCI

---
 llvm/lib/TextAPI/TextStubV5.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/llvm/lib/TextAPI/TextStubV5.cpp b/llvm/lib/TextAPI/TextStubV5.cpp
index 2f82bc03480b94..aea772dbc4be3e 100644
--- a/llvm/lib/TextAPI/TextStubV5.cpp
+++ b/llvm/lib/TextAPI/TextStubV5.cpp
@@ -201,8 +201,9 @@ Expected<StubT> getRequiredValue(
 template <typename JsonT, typename StubT = JsonT>
 Expected<StubT> getRequiredValue(
     TBDKey Key, const Object *Obj,
-    std::function<std::optional<JsonT>(const Object *, StringRef)> GetValue,
-    StubT DefaultValue, std::function<std::optional<StubT>(JsonT)> Validate) {
+    std::function<std::optional<JsonT>(const Object *, StringRef)> const
+        GetValue,
+    StubT DefaultValue, function_ref<std::optional<StubT>(JsonT)> Validate) {
   std::optional<JsonT> Val = GetValue(Obj, Keys[Key]);
   if (!Val)
     return DefaultValue;
@@ -215,7 +216,7 @@ Expected<StubT> getRequiredValue(
 }
 
 Error collectFromArray(TBDKey Key, const Object *Obj,
-                       std::function<void(StringRef)> Append,
+                       function_ref<void(StringRef)> Append,
                        bool IsRequired = false) {
   const auto *Values = Obj->getArray(Keys[Key]);
   if (!Values) {