Add test for r256912

I forgot to add this with the rest of r256912.

llvm-svn: 257088

test/Transforms/InstCombine/printf-3.ll

@@ -0,0 +1,39 @@
+; Test that the printf library call simplifier works correctly.
+;
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc18.0.0"
+
+@.str = private unnamed_addr constant [2 x i8] c"\0A\00", align 1
+
+define void @test1() personality i32 (...)* @__CxxFrameHandler3 {
+entry:
+  invoke void @_CxxThrowException(i8* null, i8* null)
+          to label %unreachable unwind label %catch.dispatch
+
+catch.dispatch:
+  %cs = catchswitch within none [label %catch] unwind to caller
+
+catch:
+  %cp = catchpad within %cs [i8* null, i32 64, i8* null]
+  %call = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i32 0, i32 0)) [ "funclet"(token %cp) ]
+  catchret from %cp to label %try.cont
+
+try.cont:
+  ret void
+
+unreachable:
+  unreachable
+}
+
+; CHECK-DAG: define void @test1(
+; CHECK: %[[CS:.*]] = catchswitch within none
+; CHECK: %[[CP:.*]] = catchpad within %[[CS]] [i8* null, i32 64, i8* null]
+; CHECK: call i32 @putchar(i32 10) [ "funclet"(token %[[CP]]) ]
+
+declare void @_CxxThrowException(i8*, i8*)
+
+declare i32 @__CxxFrameHandler3(...)
+
+declare i32 @printf(i8*, ...)