[Support] Fix CRTP for GraphWriter (NFC)

[naveen-seth]

Commit 474bbc1 forgot to change GraphWriterBase's members from private to protected.
Because of this, GraphWriter can't be properly partially specialized using CRTP.
This commit corrects that, allowing GraphWriterBase to be partially specialized using CRTP as intended.

[llvmbot]

@llvm/pr-subscribers-llvm-support

Author: Naveen Seth Hanig (naveen-seth)

Changes

Commit 474bbc1 forgot to change GraphWriterBase's members from private to protected.
Because of this, GraphWriter can't be properly partially specialized using CRTP.
This commit corrects that, allowing GraphWriterBase to be partially specialized using CRTP as intended.

---

Full diff: https://github.com/llvm/llvm-project/pull/152811.diff

1 Files Affected:

• (modified) llvm/include/llvm/Support/GraphWriter.h (+2)

diff --git a/llvm/include/llvm/Support/GraphWriter.h b/llvm/include/llvm/Support/GraphWriter.h
index af2e5016298e6..58e5b59751b67 100644
--- a/llvm/include/llvm/Support/GraphWriter.h
+++ b/llvm/include/llvm/Support/GraphWriter.h
@@ -62,6 +62,7 @@ LLVM_ABI bool DisplayGraph(StringRef Filename, bool wait = true,
                            GraphProgram::Name program = GraphProgram::DOT);
 
 template <typename GraphType, typename Derived> class GraphWriterBase {
+protected:
   raw_ostream &O;
   const GraphType &G;
   bool RenderUsingHTML = false;
@@ -73,6 +74,7 @@ template <typename GraphType, typename Derived> class GraphWriterBase {
   using child_iterator = typename GTraits::ChildIteratorType;
   DOTTraits DTraits;
 
+private:
   static_assert(std::is_pointer_v<NodeRef>,
                 "FIXME: Currently GraphWriterBase requires the NodeRef type to "
                 "be a pointer.\nThe pointer usage should be moved to "