[PragmaHandler] Expose `#pragma` location

Currently, a pragma AST node's recorded location starts at the
namespace token (such as `omp` in the case of OpenMP) after the
`#pragma` token, and the `#pragma` location isn't available.  However,
the `#pragma` location can be useful when, for example, rewriting a
directive using Clang's Rewrite facility.

This patch makes `#pragma` locations available in any `PragmaHandler`
but it doesn't yet make use of them.

This patch also uses the new `struct PragmaIntroducer` to simplify
`Preprocessor::HandlePragmaDirective`.  It doesn't do the same for
`PPCallbacks::PragmaDirective` because that changes the API documented
in `clang-tools-extra/docs/pp-trace.rst`, and I'm not sure about
backward compatibility guarantees there.

Reviewed By: ABataev, lebedev.ri, aaron.ballman

Differential Revision: https://reviews.llvm.org/D61643

llvm-svn: 361335

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/Frontend/PrintPreprocessedOutput.cpp b/clang/lib/Frontend/PrintPreprocessedOutput.cpp
index 720ed51c5f6..732edacffbe 100644
--- a/clang/lib/Frontend/PrintPreprocessedOutput.cpp
+++ b/clang/lib/Frontend/PrintPreprocessedOutput.cpp
@@ -664,7 +664,7 @@ struct UnknownPragmaHandler : public PragmaHandler {
                        bool RequireTokenExpansion)
       : Prefix(prefix), Callbacks(callbacks),
         ShouldExpandTokens(RequireTokenExpansion) {}
-  void HandlePragma(Preprocessor &PP, PragmaIntroducerKind Introducer,
+  void HandlePragma(Preprocessor &PP, PragmaIntroducer Introducer,
                     Token &PragmaTok) override {
     // Figure out what line we went to and insert the appropriate number of
     // newline characters.