[clang] [lldb] [UBSan][BoundsSafety] Implement support for more expressive "trap reasons" (PR #154618)

[via cfe-commits]

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@@ -1824,6 +1825,12 @@ class CodeGenModule : public CodeGenTypeCache {
     return PAlign;
   }
 
+  /// Helper function to construct a RuntimeTrapDiagnosticBuilder
+  [[nodiscard]] std::unique_ptr<RuntimeTrapDiagnosticBuilder>
+  RuntimeDiag(unsigned DiagID) {
+    return std::make_unique<RuntimeTrapDiagnosticBuilder>(&getDiags(), DiagID);
+  }
+
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Sirraide wrote:

We don’t usually heap-allocate these; is there any reason to not just return a 
`RuntimeTrapDiagnosticBuilder` directly?

https://github.com/llvm/llvm-project/pull/154618
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