[clang-doc][NFC] Remove unused headers (#168806)

Removes unused headers or replaces them with headers that directly
provide the symbol instead. For example, `Serialize.h` included `AST.h`,
but it was actually `Serialize.cpp` that needed concept expressions, so
now it includes just `ExprConcepts.h`.

clang-tools-extra/clang-doc/BitcodeReader.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "BitcodeReader.h"
-#include "llvm/ADT/IndexedMap.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/TimeProfiler.h"
 #include "llvm/Support/raw_ostream.h"

clang-tools-extra/clang-doc/BitcodeReader.h

@@ -17,8 +17,6 @@
 
 #include "BitcodeWriter.h"
 #include "Representation.h"
-#include "clang/AST/AST.h"
-#include "llvm/ADT/SmallVector.h"
 #include "llvm/Bitstream/BitstreamReader.h"
 #include "llvm/Support/Error.h"
 #include <optional>

clang-tools-extra/clang-doc/BitcodeWriter.h

@@ -16,12 +16,8 @@
 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_DOC_BITCODEWRITER_H
 
 #include "Representation.h"
-#include "clang/AST/AST.h"
 #include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringRef.h"
 #include "llvm/Bitstream/BitstreamWriter.h"
-#include <initializer_list>
 #include <vector>
 
 namespace clang {

clang-tools-extra/clang-doc/ClangDoc.cpp

@@ -15,13 +15,9 @@
 #include "ClangDoc.h"
 #include "Mapper.h"
 #include "Representation.h"
-#include "clang/AST/AST.h"
 #include "clang/AST/ASTConsumer.h"
-#include "clang/AST/ASTContext.h"
-#include "clang/AST/RecursiveASTVisitor.h"
 #include "clang/Frontend/ASTConsumers.h"
 #include "clang/Frontend/CompilerInstance.h"
-#include "clang/Frontend/FrontendActions.h"
 
 namespace clang {
 namespace doc {

clang-tools-extra/clang-doc/ClangDoc.h

@@ -17,8 +17,6 @@
 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_DOC_CLANGDOC_H
 
 #include "Representation.h"
-#include "clang/Tooling/Execution.h"
-#include "clang/Tooling/StandaloneExecution.h"
 #include "clang/Tooling/Tooling.h"
 
 namespace clang {

clang-tools-extra/clang-doc/Mapper.h

@@ -19,7 +19,6 @@
 
 #include "Representation.h"
 #include "clang/AST/RecursiveASTVisitor.h"
-#include "clang/Tooling/Execution.h"
 
 using namespace clang::comments;
 using namespace clang::tooling;

clang-tools-extra/clang-doc/Representation.h

@@ -16,10 +16,8 @@
 
 #include "clang/AST/Type.h"
 #include "clang/Basic/Specifiers.h"
-#include "clang/Tooling/StandaloneExecution.h"
-#include "llvm/ADT/APSInt.h"
+#include "clang/Tooling/Execution.h"
 #include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringExtras.h"
 #include <array>
 #include <optional>
 #include <string>

clang-tools-extra/clang-doc/Serialize.cpp

@@ -11,7 +11,9 @@
 
 #include "clang/AST/Attr.h"
 #include "clang/AST/Comment.h"
+#include "clang/AST/CommentVisitor.h"
 #include "clang/AST/DeclFriend.h"
+#include "clang/AST/ExprConcepts.h"
 #include "clang/AST/Mangle.h"
 #include "clang/Index/USRGeneration.h"
 #include "clang/Lex/Lexer.h"

clang-tools-extra/clang-doc/Serialize.h

@@ -16,10 +16,7 @@
 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_DOC_SERIALIZE_H
 
 #include "Representation.h"
-#include "clang/AST/AST.h"
-#include "clang/AST/CommentVisitor.h"
 #include <string>
-#include <vector>
 
 using namespace clang::comments;
 

clang-tools-extra/clang-doc/support/File.h

@@ -8,7 +8,7 @@
 #ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_DOC_FILE_H
 #define LLVM_CLANG_TOOLS_EXTRA_CLANG_DOC_FILE_H
 
-#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/SmallString.h"
 #include "llvm/Support/Error.h"
 
 namespace clang {

clang-tools-extra/clang-doc/tool/ClangDocMain.cpp

@@ -22,7 +22,6 @@
 #include "Generators.h"
 #include "Representation.h"
 #include "support/Utils.h"
-#include "clang/ASTMatchers/ASTMatchersInternal.h"
 #include "clang/Tooling/AllTUsExecution.h"
 #include "clang/Tooling/CommonOptionsParser.h"
 #include "clang/Tooling/Execution.h"
@@ -41,7 +40,6 @@
 #include <mutex>
 #include <string>
 
-using namespace clang::ast_matchers;
 using namespace clang::tooling;
 using namespace clang;