[clang] [Clang][CodeGen] Emit “trap reasons” on UBSan traps (PR #145967)

[Michael Buch via cfe-commits]

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@@ -4051,6 +4141,14 @@ void CodeGenFunction::EmitTrapCheck(llvm::Value *Checked,
 
   llvm::BasicBlock *&TrapBB = TrapBBs[CheckHandlerID];
 
+  llvm::DILocation *TrapLocation = Builder.getCurrentDebugLocation();
+  llvm::StringRef TrapMessage = GetUBSanTrapForHandler(CheckHandlerID);
+
+  if (getDebugInfo() && !TrapMessage.empty()) {
+    TrapLocation = getDebugInfo()->CreateTrapFailureMessageFor(
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Michael137 wrote:

Lets add an `assert (TrapLocation && "Artificial trap frame requires valid debug-info for its scope.")`

So if we run into the crash again this will be easier to spot

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