[llvm] [DebugInfo][NFC] Fix PDB/Native/LinePrinter.h build warning -Wmicrosoft-unqualified-friend (PR #209715)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-debuginfo

Author: Wenju He (wenju-he)

<details>
<summary>Changes</summary>

Fix build warning on Windows, which is error under -Werror: unqualified friend declaration referring to type outside of the nearest enclosing namespace is a Microsoft extension; add a nested name specifier [-Wmicrosoft-unqualified-friend]

---
Full diff: https://github.com/llvm/llvm-project/pull/209715.diff


1 Files Affected:

- (modified) llvm/include/llvm/DebugInfo/PDB/Native/LinePrinter.h (+2-1) 


``````````diff
diff --git a/llvm/include/llvm/DebugInfo/PDB/Native/LinePrinter.h b/llvm/include/llvm/DebugInfo/PDB/Native/LinePrinter.h
index 95293ba0818d5..bf77a3d19d9d4 100644
--- a/llvm/include/llvm/DebugInfo/PDB/Native/LinePrinter.h
+++ b/llvm/include/llvm/DebugInfo/PDB/Native/LinePrinter.h
@@ -47,9 +47,10 @@ namespace pdb {
 class ClassLayout;
 class PDBFile;
 class SymbolGroup;
+class WithColor;
 
 class LinePrinter {
-  friend class WithColor;
+  friend class pdb::WithColor;
 
 public:
   LLVM_ABI LinePrinter(int Indent, bool UseColor, raw_ostream &Stream,

``````````

</details>


https://github.com/llvm/llvm-project/pull/209715