[llvm] [Support] Simplify Object::operator== (NFC) (PR #157311)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/157311

This patch simplifies Object::operator== with DenseMap::operator==.


>From 351ed02fedfa8872d6ee016fe020a4a96d597a5d Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Fri, 5 Sep 2025 16:10:35 -0700
Subject: [PATCH] [Support] Simplify Object::operator== (NFC)

This patch simplifies Object::operator== with DenseMap::operator==.
---
 llvm/include/llvm/Support/JSON.h |  2 ++
 llvm/lib/Support/JSON.cpp        | 11 +----------
 2 files changed, 3 insertions(+), 10 deletions(-)

diff --git a/llvm/include/llvm/Support/JSON.h b/llvm/include/llvm/Support/JSON.h
index 74858ec559932..d8c6de49b4bc6 100644
--- a/llvm/include/llvm/Support/JSON.h
+++ b/llvm/include/llvm/Support/JSON.h
@@ -153,6 +153,8 @@ class Object {
   LLVM_ABI json::Object *getObject(StringRef K);
   LLVM_ABI const json::Array *getArray(StringRef K) const;
   LLVM_ABI json::Array *getArray(StringRef K);
+
+  friend bool operator==(const Object &LHS, const Object &RHS);
 };
 LLVM_ABI bool operator==(const Object &LHS, const Object &RHS);
 inline bool operator!=(const Object &LHS, const Object &RHS) {
diff --git a/llvm/lib/Support/JSON.cpp b/llvm/lib/Support/JSON.cpp
index d8662340cb3ed..4652c0740dc4d 100644
--- a/llvm/lib/Support/JSON.cpp
+++ b/llvm/lib/Support/JSON.cpp
@@ -84,16 +84,7 @@ json::Array *Object::getArray(StringRef K) {
     return V->getAsArray();
   return nullptr;
 }
-bool operator==(const Object &LHS, const Object &RHS) {
-  if (LHS.size() != RHS.size())
-    return false;
-  for (const auto &L : LHS) {
-    auto R = RHS.find(L.first);
-    if (R == RHS.end() || L.second != R->second)
-      return false;
-  }
-  return true;
-}
+bool operator==(const Object &LHS, const Object &RHS) { return LHS.M == RHS.M; }
 
 Array::Array(std::initializer_list<Value> Elements) {
   V.reserve(Elements.size());