dead calls to llvm.stacksave can be deleted, even though they
have potential side-effects.

llvm-svn: 45392
diff --git a/llvm/test/Transforms/InstCombine/deadcode.ll b/llvm/test/Transforms/InstCombine/deadcode.ll
index 6ff5ae8..43c1793 100644
--- a/llvm/test/Transforms/InstCombine/deadcode.ll
+++ b/llvm/test/Transforms/InstCombine/deadcode.ll
@@ -1,4 +1,5 @@
 ; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {ret i32 %A}
+; RUN: llvm-as < %s | opt -die | llvm-dis | not grep call.*llvm.stacksave
 
 define i32 @test(i32 %A) {
 	%X = or i1 false, false		
@@ -12,3 +13,12 @@
 	%C.upgrd.1 = phi i32 [ %B, %T ], [ %A, %0 ]
 	ret i32 %C.upgrd.1
 }
+
+define i32* @test2(i32 %width) {
+	%tmp = call i8* @llvm.stacksave( )
+        %tmp14 = alloca i32, i32 %width
+	ret i32* %tmp14
+} 
+
+declare i8* @llvm.stacksave()
+