Replace tok::angle_string_literal with new tok::header_name.

Use the new kind for both angled header-name tokens and for
double-quoted header-name tokens.

This is in preparation for C++20's context-sensitive header-name token
formation rules.

llvm-svn: 356530
diff --git a/clang/lib/Lex/Pragma.cpp b/clang/lib/Lex/Pragma.cpp
index 369fd92..286b863 100644
--- a/clang/lib/Lex/Pragma.cpp
+++ b/clang/lib/Lex/Pragma.cpp
@@ -486,7 +486,7 @@
     return;
 
   // If the next token wasn't a header-name, diagnose the error.
-  if (!FilenameTok.isOneOf(tok::angle_string_literal, tok::string_literal)) {
+  if (FilenameTok.isNot(tok::header_name)) {
     Diag(FilenameTok.getLocation(), diag::err_pp_expects_filename);
     return;
   }
@@ -670,8 +670,7 @@
 
   StringRef SourceFileName;
   SmallString<128> FileNameBuffer;
-  if (SourceFilenameTok.is(tok::string_literal) ||
-      SourceFilenameTok.is(tok::angle_string_literal)) {
+  if (SourceFilenameTok.is(tok::header_name)) {
     SourceFileName = getSpelling(SourceFilenameTok, FileNameBuffer);
   } else {
     Diag(Tok, diag::warn_pragma_include_alias_expected_filename);
@@ -691,8 +690,7 @@
     return;
 
   StringRef ReplaceFileName;
-  if (ReplaceFilenameTok.is(tok::string_literal) ||
-      ReplaceFilenameTok.is(tok::angle_string_literal)) {
+  if (ReplaceFilenameTok.is(tok::header_name)) {
     ReplaceFileName = getSpelling(ReplaceFilenameTok, FileNameBuffer);
   } else {
     Diag(Tok, diag::warn_pragma_include_alias_expected_filename);