Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/test/Transforms/DeadArgElim/deadretval.ll

@@ -0,0 +1,18 @@
+; RUN: opt < %s -deadargelim -S | not grep DEAD
+
+; Dead arg only used by dead retval
+define internal i32 @test(i32 %DEADARG) {
+        ret i32 %DEADARG
+}
+
+define i32 @test2(i32 %A) {
+        %DEAD = call i32 @test( i32 %A )                ; <i32> [#uses=0]
+        ret i32 123
+}
+
+define i32 @test3() {
+        %X = call i32 @test2( i32 3232 )                ; <i32> [#uses=1]
+        %Y = add i32 %X, -123           ; <i32> [#uses=1]
+        ret i32 %Y
+}
+