Test case for r246304.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@246306 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/X86/tailcall-readnone.ll

@@ -0,0 +1,15 @@
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -o - %s | FileCheck %s
+
+define void @f(i32** %p) unnamed_addr {
+entry:
+  %v = tail call i32* @g()
+  store i32* %v, i32** %p, align 8
+  ret void
+}
+; CHECK-LABEL: f:
+; CHECK: callq g
+; CHECK: movq    %rax, (%rbx)
+
+declare i32* @g() #2
+
+attributes #2 = { nounwind readnone }