GlobalOpt: Don't swap private for internal linkage

There were transforms whose *intent* was to downgrade the linkage of
external objects to have internal linkage.

However, it fired on things with private linkage as well.

llvm-svn: 212104
diff --git a/llvm/test/Transforms/GlobalOpt/2009-03-06-Anonymous.ll b/llvm/test/Transforms/GlobalOpt/2009-03-06-Anonymous.ll
index db2673a..930a96e 100644
--- a/llvm/test/Transforms/GlobalOpt/2009-03-06-Anonymous.ll
+++ b/llvm/test/Transforms/GlobalOpt/2009-03-06-Anonymous.ll
@@ -1,13 +1,23 @@
 ; RUN: opt < %s -globalopt -S | FileCheck %s
 
 global i32 0
-; CHECK: @0 = internal global i32 0
-define i32* @1() {
+; CHECK-DAG: @0 = internal global i32 0
+
+private global i32 0
+; CHECK-DAG: @1 = private global i32 0
+
+define i32* @2() {
 	ret i32* @0
 }
-; CHECK: define internal fastcc i32* @1()
+; CHECK-DAG: define internal fastcc i32* @2()
+
 define i32* @f() {
 entry:
-	call i32* @1()
+	call i32* @2()
 	ret i32* %0
 }
+
+define i32* @g() {
+entry:
+	ret i32* @1
+}