Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/Other/opt-twice.ll

@@ -0,0 +1,14 @@
+; The pass here doesn't matter (we use deadargelim), but test
+; that the -run-twice options exists, generates output, and
+; doesn't crash
+; RUN: opt -run-twice -deadargelim -S < %s | FileCheck %s
+
+; CHECK: define internal void @test
+define internal {} @test() {
+  ret {} undef
+}
+
+define void @caller() {
+  call {} @test()
+  ret void
+}