[SEH] Ignore EH pad check for internal intrinsics (llvm#79694)

Intrinsics like @llvm.seh.scope.begin and @llvm.seh.scope.end which do
not throw do not need funclets in catchpads or cleanuppads.

Fixes llvm#69428

Co-authored-by: Robert Cox <[email protected]>

---------

Co-authored-by: Robert Cox <[email protected]>

Author: phoebewang

llvm/lib/IR/Verifier.cpp

@@ -4343,6 +4343,11 @@ void Verifier::visitEHPadPredecessors(Instruction &I) {
     if (auto *II = dyn_cast<InvokeInst>(TI)) {
       Check(II->getUnwindDest() == BB && II->getNormalDest() != BB,
             "EH pad must be jumped to via an unwind edge", ToPad, II);
+      auto *CalledFn =
+          dyn_cast<Function>(II->getCalledOperand()->stripPointerCasts());
+      if (CalledFn && CalledFn->isIntrinsic() && II->doesNotThrow() &&
+          !IntrinsicInst::mayLowerToFunctionCall(CalledFn->getIntrinsicID()))
+        continue;
       if (auto Bundle = II->getOperandBundle(LLVMContext::OB_funclet))
         FromPad = Bundle->Inputs[0];
       else

llvm/test/Verifier/pr69428.ll

@@ -0,0 +1,48 @@
+; RUN: llvm-as -disable-output %s
+
+%struct._List_node_emplace_op2 = type { i8 }
+
+@"?_List@@3HA" = global i32 0, align 4
+
+define void @"?ExecutionEngineaddExecutableDependency@@YAXXZ"() personality ptr @__CxxFrameHandler3 {
+entry:
+  %agg.tmp.ensured.i = alloca %struct._List_node_emplace_op2, align 1
+  %0 = load i32, ptr @"?_List@@3HA", align 4
+  %call.i = call noundef ptr @"??0?$_List_node_emplace_op2@H@@QEAA@H@Z"(ptr %agg.tmp.ensured.i, i32 %0)
+  invoke void @llvm.seh.scope.begin()
+          to label %invoke.cont.i unwind label %ehcleanup.i
+
+invoke.cont.i:                                    ; preds = %entry
+  invoke void @llvm.seh.scope.end()
+          to label %invoke.cont2.i unwind label %ehcleanup.i
+
+invoke.cont2.i:                                   ; preds = %invoke.cont.i
+  call void @"??1?$_List_node_emplace_op2@H@@QEAA@XZ"(ptr %agg.tmp.ensured.i) #6
+  unreachable
+
+ehcleanup.i:                                      ; preds = %invoke.cont.i, %entry
+  %1 = cleanuppad within none []
+  invoke void @llvm.seh.scope.begin()
+          to label %invoke.cont.i.i unwind label %ehcleanup.i.i
+
+invoke.cont.i.i:                                  ; preds = %ehcleanup.i
+  invoke void @llvm.seh.scope.end()
+          to label %"??1?$_List_node_emplace_op2@H@@[email protected]" unwind label %ehcleanup.i.i
+
+ehcleanup.i.i:                                    ; preds = %invoke.cont.i.i, %ehcleanup.i
+  %2 = cleanuppad within %1 []
+  call void @"??1_Alloc_construct_ptr@@QEAA@XZ"(ptr %agg.tmp.ensured.i) #6 [ "funclet"(token %2) ]
+  cleanupret from %2 unwind to caller
+
+"??1?$_List_node_emplace_op2@H@@[email protected]":  ; preds = %invoke.cont.i.i
+  call void @"??1_Alloc_construct_ptr@@QEAA@XZ"(ptr %agg.tmp.ensured.i) #6 [ "funclet"(token %1) ]
+  cleanupret from %1 unwind to caller
+}
+
+declare i32 @__CxxFrameHandler3(...)
+declare void @llvm.seh.scope.begin()
+declare void @llvm.seh.scope.end()
+
+declare void @"??1?$_List_node_emplace_op2@H@@QEAA@XZ"(ptr)
+declare void @"??1_Alloc_construct_ptr@@QEAA@XZ"(ptr)
+declare ptr @"??0?$_List_node_emplace_op2@H@@QEAA@H@Z"(ptr, i32)