[DwarfEhPrepare] Assign dummy debug location for more inserted _Unwind_Resume calls (#105513)

Similar to the fix for #57469, ensure that the other `_Unwind_Resume`
call emitted by DwarfEHPrepare has a debug location if needed.

This fixes nbdd0121/unwinding#34.

Author: sunfishcode

llvm/lib/CodeGen/DwarfEHPrepare.cpp

@@ -293,6 +293,13 @@ bool DwarfEHPrepare::InsertUnwindResumeCalls() {
   // Call the function.
   CallInst *CI =
       CallInst::Create(RewindFunction, RewindFunctionArgs, "", UnwindBB);
+  // The verifier requires that all calls of debug-info-bearing functions
+  // from debug-info-bearing functions have a debug location (for inlining
+  // purposes). Assign a dummy location to satisfy the constraint.
+  Function *RewindFn = dyn_cast<Function>(RewindFunction.getCallee());
+  if (RewindFn && RewindFn->getSubprogram())
+    if (DISubprogram *SP = F.getSubprogram())
+      CI->setDebugLoc(DILocation::get(SP->getContext(), 0, 0, SP));
   CI->setCallingConv(RewindFunctionCallingConv);
 
   // We never expect _Unwind_Resume to return.