[clang-tidy][NFC] move AST_MATCHER to anonymous namespace in InfiniteLoopCheck (#118820)

Author: HerrCai0907

clang-tools-extra/clang-tidy/bugprone/InfiniteLoopCheck.cpp

@@ -13,13 +13,15 @@
 #include "clang/Analysis/Analyses/ExprMutationAnalyzer.h"
 #include "clang/Analysis/CallGraph.h"
 #include "llvm/ADT/SCCIterator.h"
-#include "llvm/ADT/SmallVector.h"
 
 using namespace clang::ast_matchers;
+using clang::ast_matchers::internal::Matcher;
 using clang::tidy::utils::hasPtrOrReferenceInFunc;
 
 namespace clang {
-namespace ast_matchers {
+namespace tidy::bugprone {
+
+namespace {
 /// matches a Decl if it has a  "no return" attribute of any kind
 AST_MATCHER(Decl, declHasNoReturnAttr) {
   return Node.hasAttr<NoReturnAttr>() || Node.hasAttr<CXX11NoReturnAttr>() ||
@@ -30,23 +32,21 @@ AST_MATCHER(Decl, declHasNoReturnAttr) {
 AST_MATCHER(FunctionType, typeHasNoReturnAttr) {
   return Node.getNoReturnAttr();
 }
-} // namespace ast_matchers
-namespace tidy::bugprone {
+} // namespace
 
-static internal::Matcher<Stmt>
-loopEndingStmt(internal::Matcher<Stmt> Internal) {
-  internal::Matcher<QualType> isNoReturnFunType =
+static Matcher<Stmt> loopEndingStmt(Matcher<Stmt> Internal) {
+  Matcher<QualType> IsNoReturnFunType =
       ignoringParens(functionType(typeHasNoReturnAttr()));
-  internal::Matcher<Decl> isNoReturnDecl =
-      anyOf(declHasNoReturnAttr(), functionDecl(hasType(isNoReturnFunType)),
-            varDecl(hasType(blockPointerType(pointee(isNoReturnFunType)))));
+  Matcher<Decl> IsNoReturnDecl =
+      anyOf(declHasNoReturnAttr(), functionDecl(hasType(IsNoReturnFunType)),
+            varDecl(hasType(blockPointerType(pointee(IsNoReturnFunType)))));
 
   return stmt(anyOf(
       mapAnyOf(breakStmt, returnStmt, gotoStmt, cxxThrowExpr).with(Internal),
       callExpr(Internal,
                callee(mapAnyOf(functionDecl, /* block callee */ varDecl)
-                          .with(isNoReturnDecl))),
-      objcMessageExpr(Internal, callee(isNoReturnDecl))));
+                          .with(IsNoReturnDecl))),
+      objcMessageExpr(Internal, callee(IsNoReturnDecl))));
 }
 
 /// Return whether `Var` was changed in `LoopStmt`.