Revert "[clang-tidy] fix false positives for the functions with the same name as standard library functions in misc-include-cleaner (#94923)"

This reverts commit 1bae108. Also add
some test cases to prevent further regressions.

Author: kadircet

clang-tools-extra/docs/ReleaseNotes.rst

@@ -341,10 +341,6 @@ Changes in existing checks
   <clang-tidy/checks/misc/header-include-cycle>` check by avoiding crash for self
   include cycles.
 
-- Improved :doc:`misc-include-cleaner
-  <clang-tidy/checks/misc/include-cleaner>` check by avoiding false positives for
-  the functions with the same name as standard library functions.
-
 - Improved :doc:`misc-unused-using-decls
   <clang-tidy/checks/misc/unused-using-decls>` check by replacing the local
   option `HeaderFileExtensions` by the global option of the same name.

clang-tools-extra/include-cleaner/lib/LocateSymbol.cpp

@@ -14,7 +14,6 @@
 #include "clang/AST/DeclTemplate.h"
 #include "clang/Tooling/Inclusions/StandardLibrary.h"
 #include "llvm/Support/Casting.h"
-#include "llvm/Support/raw_ostream.h"
 #include <utility>
 #include <vector>
 
@@ -41,11 +40,8 @@ Hints declHints(const Decl *D) {
 std::vector<Hinted<SymbolLocation>> locateDecl(const Decl &D) {
   std::vector<Hinted<SymbolLocation>> Result;
   // FIXME: Should we also provide physical locations?
-  if (auto SS = tooling::stdlib::Recognizer()(&D)) {
-    Result.push_back({*SS, Hints::CompleteSymbol});
-    if (!D.hasBody())
-      return Result;
-  }
+  if (auto SS = tooling::stdlib::Recognizer()(&D))
+    return {{*SS, Hints::CompleteSymbol}};
   // FIXME: Signal foreign decls, e.g. a forward declaration not owned by a
   // library. Some useful signals could be derived by checking the DeclContext.
   // Most incidental forward decls look like:

clang-tools-extra/include-cleaner/unittests/FindHeadersTest.cpp

@@ -619,26 +619,23 @@ TEST_F(HeadersForSymbolTest, AmbiguousStdSymbolsUsingShadow) {
 
 
 TEST_F(HeadersForSymbolTest, StandardHeaders) {
-  Inputs.Code = "void assert();";
+  Inputs.Code = R"cpp(
+    #include "stdlib_internal.h"
+    void assert();
+    void foo() { assert(); }
+  )cpp";
+  Inputs.ExtraFiles["stdlib_internal.h"] = "void assert();";
   buildAST();
   EXPECT_THAT(
       headersFor("assert"),
       // Respect the ordering from the stdlib mapping.
+      // FIXME: Report physical locations too, stdlib_internal.h and main-file
+      // should also be candidates. But they should be down-ranked compared to
+      // stdlib providers.
       UnorderedElementsAre(tooling::stdlib::Header::named("<cassert>"),
                            tooling::stdlib::Header::named("<assert.h>")));
 }
 
-TEST_F(HeadersForSymbolTest, NonStandardHeaders) {
-  Inputs.Code = "void assert() {}";
-  buildAST();
-  EXPECT_THAT(
-      headersFor("assert"),
-      // Respect the ordering from the stdlib mapping.
-      UnorderedElementsAre(physicalHeader("input.mm"),
-                           tooling::stdlib::Header::named("<cassert>"),
-                           tooling::stdlib::Header::named("<assert.h>")));
-}
-
 TEST_F(HeadersForSymbolTest, ExporterNoNameMatch) {
   Inputs.Code = R"cpp(
     #include "exporter/foo.h"

clang-tools-extra/test/clang-tidy/checkers/misc/include-cleaner.cpp

@@ -15,11 +15,3 @@ std::string HelloString;
 // CHECK-MESSAGES: :[[@LINE-1]]:6: warning: no header providing "std::string" is directly included [misc-include-cleaner]
 int FooBarResult = foobar();
 // CHECK-MESSAGES: :[[@LINE-1]]:20: warning: no header providing "foobar" is directly included [misc-include-cleaner]
-
-namespace valid {
-
-namespace gh93335 {
-void log2() {}
-} // namespace gh93335
-
-} // namespace valid