================
@@ -0,0 +1,22 @@
+// FIXME: Currently, a nullptr check is in place before emitting a UBSan trap 
reason inside 
+// CodeGenFunction::EmitTrapCheck. This is disadvantageous because we may not 
emit a trap 
+// message in all cases where a trap message should be emitted. The check was 
added to prevent
+// a crash caused by a call to EmitTypeCheck in 
CodeGenFunction::StartFunction. The TypeMismatch 
+// handler is triggered and tries to attach itself to the debug-info location, 
but StartFunction 
+// only sets the debug-info location after the prologue code-gen is done 
resulting in a crash.
----------------
anthonyhatran wrote:

Rephrased

https://github.com/llvm/llvm-project/pull/145967
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