[clang][NFC] Move isSimpleTypeSpecifier() from Sema to Token (#80101)

So that it can be used by clang-format.

clang/include/clang/Lex/Token.h

@@ -22,6 +22,7 @@
 namespace clang {
 
 class IdentifierInfo;
+class LangOptions;
 
 /// Token - This structure provides full information about a lexed token.
 /// It is not intended to be space efficient, it is intended to return as much
@@ -288,6 +289,8 @@ public:
   /// Return the ObjC keyword kind.
   tok::ObjCKeywordKind getObjCKeywordID() const;
 
+  bool isSimpleTypeSpecifier(const LangOptions &LangOpts) const;
+
   /// Return true if this token has trigraphs or escaped newlines in it.
   bool needsCleaning() const { return getFlag(NeedsCleaning); }
 

clang/include/clang/Sema/Sema.h

@@ -2683,8 +2683,6 @@ public:
 
   void DiagnoseUseOfUnimplementedSelectors();
 
-  bool isSimpleTypeSpecifier(const Token &Tok) const;
-
   ParsedType getTypeName(const IdentifierInfo &II, SourceLocation NameLoc,
                          Scope *S, CXXScopeSpec *SS = nullptr,
                          bool isClassName = false, bool HasTrailingDot = false,

clang/lib/Lex/Lexer.cpp

@@ -74,6 +74,51 @@ tok::ObjCKeywordKind Token::getObjCKeywordID() const {
   return specId ? specId->getObjCKeywordID() : tok::objc_not_keyword;
 }
 
+/// Determine whether the token kind starts a simple-type-specifier.
+bool Token::isSimpleTypeSpecifier(const LangOptions &LangOpts) const {
+  switch (getKind()) {
+  case tok::annot_typename:
+  case tok::annot_decltype:
+  case tok::annot_pack_indexing_type:
+    return true;
+
+  case tok::kw_short:
+  case tok::kw_long:
+  case tok::kw___int64:
+  case tok::kw___int128:
+  case tok::kw_signed:
+  case tok::kw_unsigned:
+  case tok::kw_void:
+  case tok::kw_char:
+  case tok::kw_int:
+  case tok::kw_half:
+  case tok::kw_float:
+  case tok::kw_double:
+  case tok::kw___bf16:
+  case tok::kw__Float16:
+  case tok::kw___float128:
+  case tok::kw___ibm128:
+  case tok::kw_wchar_t:
+  case tok::kw_bool:
+  case tok::kw__Bool:
+  case tok::kw__Accum:
+  case tok::kw__Fract:
+  case tok::kw__Sat:
+#define TRANSFORM_TYPE_TRAIT_DEF(_, Trait) case tok::kw___##Trait:
+#include "clang/Basic/TransformTypeTraits.def"
+  case tok::kw___auto_type:
+  case tok::kw_char16_t:
+  case tok::kw_char32_t:
+  case tok::kw_typeof:
+  case tok::kw_decltype:
+  case tok::kw_char8_t:
+    return getIdentifierInfo()->isKeyword(LangOpts);
+
+  default:
+    return false;
+  }
+}
+
 //===----------------------------------------------------------------------===//
 // Lexer Class Implementation
 //===----------------------------------------------------------------------===//

clang/lib/Parse/ParseExpr.cpp

@@ -1609,7 +1609,7 @@ ExprResult Parser::ParseCastExpression(CastParseKind ParseKind,
       if (TryAnnotateTypeOrScopeToken())
         return ExprError();
 
-      if (!Actions.isSimpleTypeSpecifier(Tok))
+      if (!Tok.isSimpleTypeSpecifier(getLangOpts()))
         // We are trying to parse a simple-type-specifier but might not get such
         // a token after error recovery.
         return ExprError();

clang/lib/Parse/ParseObjc.cpp

@@ -2971,7 +2971,7 @@ bool Parser::ParseObjCXXMessageReceiver(bool &IsExpr, void *&TypeOrExpr) {
                   tok::annot_cxxscope))
     TryAnnotateTypeOrScopeToken();
 
-  if (!Actions.isSimpleTypeSpecifier(Tok)) {
+  if (!Tok.isSimpleTypeSpecifier(getLangOpts())) {
     //   objc-receiver:
     //     expression
     // Make sure any typos in the receiver are corrected or diagnosed, so that

clang/lib/Sema/SemaDecl.cpp

@@ -127,51 +127,6 @@ class TypeNameValidatorCCC final : public CorrectionCandidateCallback {
 
 } // end anonymous namespace
 
-/// Determine whether the token kind starts a simple-type-specifier.
-bool Sema::isSimpleTypeSpecifier(const Token &Tok) const {
-  switch (Tok.getKind()) {
-  case tok::annot_typename:
-  case tok::annot_decltype:
-  case tok::annot_pack_indexing_type:
-    return true;
-
-  case tok::kw_short:
-  case tok::kw_long:
-  case tok::kw___int64:
-  case tok::kw___int128:
-  case tok::kw_signed:
-  case tok::kw_unsigned:
-  case tok::kw_void:
-  case tok::kw_char:
-  case tok::kw_int:
-  case tok::kw_half:
-  case tok::kw_float:
-  case tok::kw_double:
-  case tok::kw___bf16:
-  case tok::kw__Float16:
-  case tok::kw___float128:
-  case tok::kw___ibm128:
-  case tok::kw_wchar_t:
-  case tok::kw_bool:
-  case tok::kw__Bool:
-  case tok::kw__Accum:
-  case tok::kw__Fract:
-  case tok::kw__Sat:
-#define TRANSFORM_TYPE_TRAIT_DEF(_, Trait) case tok::kw___##Trait:
-#include "clang/Basic/TransformTypeTraits.def"
-  case tok::kw___auto_type:
-  case tok::kw_char16_t:
-  case tok::kw_char32_t:
-  case tok::kw_typeof:
-  case tok::kw_decltype:
-  case tok::kw_char8_t:
-    return Tok.getIdentifierInfo()->isKeyword(getLangOpts());
-
-  default:
-    return false;
-  }
-}
-
 namespace {
 enum class UnqualifiedTypeNameLookupResult {
   NotFound,