[clang] [clang-tools-extra] [llvm] [clang] Introduce diagnostics suppression mappings (PR #112517)

[kadir çetinkaya via cfe-commits]

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@@ -70,6 +76,16 @@ void clang::ProcessWarningOptions(DiagnosticsEngine &Diags,
   else
     Diags.setExtensionHandlingBehavior(diag::Severity::Ignored);
 
+  if (!Opts.DiagnosticSuppressionMappingsFile.empty()) {
+    if (auto Buf =
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kadircet wrote:

i think [Buf](https://github.com/search?type=code&auto_enroll=true&q=repo%3Allvm%2Fllvm-project+%2Fbuf.*%3D.*%5Cn%3F.*getBufferForFile%2F) version is more common than anything involving [File](https://github.com/search?type=code&auto_enroll=true&q=repo%3Allvm%2Fllvm-project+%2Ffile.*%3D.*%5Cn%3F.*getBufferForFile%2F).

Moreover, this is really a memory-buffer object, that doesn't have ties to any file anymore. So I'd argue that conceptually calling it `Buf` also makes more sense.

https://github.com/llvm/llvm-project/pull/112517