[clang-format][NFC] Don't export IsCpp in Format.h

clang/include/clang/Format/Format.h

@@ -5228,9 +5228,6 @@ extern const char *DefaultFormatStyle;
 /// Different builds can modify the value to the preferred styles.
 extern const char *DefaultFallbackStyle;
 
-/// Whether the language is C/C++/Objective-C/Objective-C++.
-extern bool IsCpp;
-
 /// Construct a FormatStyle based on ``StyleName``.
 ///
 /// ``StyleName`` can take several forms:

clang/lib/Format/Format.cpp

@@ -3915,8 +3915,6 @@ const char *DefaultFormatStyle = "file";
 
 const char *DefaultFallbackStyle = "LLVM";
 
-bool IsCpp = false;
-
 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
 loadAndParseConfigFile(StringRef ConfigFile, llvm::vfs::FileSystem *FS,
                        FormatStyle *Style, bool AllowUnknownOptions) {

clang/lib/Format/FormatToken.cpp

@@ -18,6 +18,8 @@
 namespace clang {
 namespace format {
 
+bool IsCpp = false;
+
 const char *getTokenTypeName(TokenType Type) {
   static const char *const TokNames[] = {
 #define TYPE(X) #X,

clang/lib/Format/FormatToken.h

@@ -24,6 +24,9 @@
 namespace clang {
 namespace format {
 
+/// Whether the language is C/C++/Objective-C/Objective-C++.
+extern bool IsCpp;
+
 #define LIST_TOKEN_TYPES                                                       \
   TYPE(ArrayInitializerLSquare)                                                \
   TYPE(ArraySubscriptLSquare)                                                  \