[clang-tools-extra] [clang-tidy] Make `bugprone-unhandled-self-assignment` check more general (PR #147066)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp -- clang-tools-extra/clang-tidy/bugprone/UnhandledSelfAssignmentCheck.cpp clang-tools-extra/test/clang-tidy/checkers/bugprone/unhandled-self-assignment.cpp
``````````

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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clang-tidy/bugprone/UnhandledSelfAssignmentCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/UnhandledSelfAssignmentCheck.cpp
index 8307e744a..69f02ee37 100644
--- a/clang-tools-extra/clang-tidy/bugprone/UnhandledSelfAssignmentCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/UnhandledSelfAssignmentCheck.cpp
@@ -68,7 +68,7 @@ void UnhandledSelfAssignmentCheck::registerMatchers(MatchFinder *Finder) {
   const auto HasNoNestedSelfAssign =
       cxxMethodDecl(unless(hasDescendant(cxxMemberCallExpr(callee(cxxMethodDecl(
           hasName("operator="), ofClass(equalsBoundNode("class"))))))));
-  
+
   // Checking that some kind of constructor is called and followed by a `swap`:
   // T& operator=(const T& other) {
   //    T tmp{this->internal_data(), some, other, args};
@@ -84,7 +84,7 @@ void UnhandledSelfAssignmentCheck::registerMatchers(MatchFinder *Finder) {
                hasDescendant(callExpr(callee(functionDecl(hasName("swap"))),
                                       hasAnyArgument(declRefExpr(to(varDecl(
                                           equalsBoundNode("tmp_var"))))))))));
-    
+
   DeclarationMatcher AdditionalMatcher = cxxMethodDecl();
   if (WarnOnlyIfThisHasSuspiciousField) {
     // Matcher for standard smart pointers.
@@ -105,15 +105,14 @@ void UnhandledSelfAssignmentCheck::registerMatchers(MatchFinder *Finder) {
                             hasType(arrayType())))))));
   }
 
-  Finder->addMatcher(cxxMethodDecl(ofClass(cxxRecordDecl().bind("class")),
-                                   isCopyAssignmentOperator(), IsUserDefined,
-                                   HasReferenceParam, HasNoSelfCheck,
-                                   unless(HasNonTemplateSelfCopy),
-                                   unless(HasTemplateSelfCopy),
-                                   unless(HasCopyAndSwap),
-                                   HasNoNestedSelfAssign, AdditionalMatcher)
-                         .bind("copyAssignmentOperator"),
-                     this);
+  Finder->addMatcher(
+      cxxMethodDecl(
+          ofClass(cxxRecordDecl().bind("class")), isCopyAssignmentOperator(),
+          IsUserDefined, HasReferenceParam, HasNoSelfCheck,
+          unless(HasNonTemplateSelfCopy), unless(HasTemplateSelfCopy),
+          unless(HasCopyAndSwap), HasNoNestedSelfAssign, AdditionalMatcher)
+          .bind("copyAssignmentOperator"),
+      this);
 }
 
 void UnhandledSelfAssignmentCheck::check(

``````````

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https://github.com/llvm/llvm-project/pull/147066