[clang-tools-extra] [clang-doc] Remove unused simple_ilist comparison operators (NFC) (PR #206309)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-tools-extra

Author: Aditya Medhane (flash1729)

<details>
<summary>Changes</summary>

These operator== and operator!= templates in YAMLGenerator.cpp were never called. They went in as infrastructure that never got wired up, and a later static cleanup exposed them under -Wunused-template. Remove the dead code.

NFC. Part of #<!-- -->202945.

---
Full diff: https://github.com/llvm/llvm-project/pull/206309.diff


1 Files Affected:

- (modified) clang-tools-extra/clang-doc/YAMLGenerator.cpp (-18) 


``````````diff
diff --git a/clang-tools-extra/clang-doc/YAMLGenerator.cpp b/clang-tools-extra/clang-doc/YAMLGenerator.cpp
index 5a1d822526daa..7ccf526c59e22 100644
--- a/clang-tools-extra/clang-doc/YAMLGenerator.cpp
+++ b/clang-tools-extra/clang-doc/YAMLGenerator.cpp
@@ -32,24 +32,6 @@ LLVM_YAML_IS_SEQUENCE_VECTOR(BaseRecordInfo)
 
 namespace llvm {
 
-template <typename T>
-static bool operator==(const llvm::simple_ilist<T> &LHS,
-                       const llvm::simple_ilist<T> &RHS) {
-  auto LIt = LHS.begin(), LEnd = LHS.end();
-  auto RIt = RHS.begin(), REnd = RHS.end();
-  for (; LIt != LEnd && RIt != REnd; ++LIt, ++RIt) {
-    if (!(*LIt == *RIt))
-      return false;
-  }
-  return LIt == LEnd && RIt == REnd;
-}
-
-template <typename T>
-static bool operator!=(const llvm::simple_ilist<T> &LHS,
-                       const llvm::simple_ilist<T> &RHS) {
-  return !(LHS == RHS);
-}
-
 namespace yaml {
 
 // Provide SequenceTraits for ArrayRef<T*> since YAMLTraits only provides it for

``````````

</details>


https://github.com/llvm/llvm-project/pull/206309