Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/llvm/test/Transforms/DeadArgElim/canon.ll

@@ -0,0 +1,24 @@
+; This test shows a few canonicalizations made by deadargelim
+; RUN: opt < %s -deadargelim -S > %t
+; This test should remove {} and replace it with void
+; RUN: cat %t | grep "define internal void @test"
+; This test shouls replace the {i32} return value with just i32
+; RUN: cat %t | grep "define internal i32 @test2"
+
+define internal {} @test() {
+  ret {} undef
+}
+
+define internal {i32} @test2() {
+  ret {i32} undef
+}
+
+define void @caller() {
+  call {} @test()
+  %X = call {i32} @test2()
+  %Y = extractvalue {i32} %X, 0
+  call void @user(i32 %Y, {i32} %X)
+  ret void
+}
+
+declare void @user(i32, {i32})