[clang-tools-extra] [llvm] [clang-tidy] New check `misc-header-guard` (PR #177315)

[Baranov Victor via cfe-commits]

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@@ -160,6 +160,9 @@ SourceLocation getUnifiedEndLoc(const Stmt &S, const SourceManager &SM,
 SourceLocation getLocationForNoexceptSpecifier(const FunctionDecl *FuncDecl,
                                                const SourceManager &SM);
 
+/// Returns ``true`` if the pragma directive at \p Loc is a ``#pragma once``.
+bool hasPragmaOnce(SourceLocation Loc, const SourceManager &SM);
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vbvictor wrote:

Nit
```suggestion
bool isPragmaOnce(SourceLocation Loc, const SourceManager &SM);
```

https://github.com/llvm/llvm-project/pull/177315