Give string constants generated by IRBuilder private linkage.

Fixes PR11640.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147144 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Transforms/SimplifyLibCalls/Printf.ll b/test/Transforms/SimplifyLibCalls/Printf.ll
index c98e79a..489c993 100644
--- a/test/Transforms/SimplifyLibCalls/Printf.ll
+++ b/test/Transforms/SimplifyLibCalls/Printf.ll
@@ -3,7 +3,7 @@
 @str = internal constant [13 x i8] c"hello world\0A\00"         ; <[13 x i8]*> [#uses=1]
 @str1 = internal constant [2 x i8] c"h\00"              ; <[2 x i8]*> [#uses=1]
 
-; CHECK: internal unnamed_addr constant [12 x i8] c"hello world\00"
+; CHECK: private unnamed_addr constant [12 x i8] c"hello world\00"
 
 declare i32 @printf(i8*, ...)