One more attempt to fix PS4 buildbot after r375219

PS4 buildbot seems to be dropping variable names for some reason


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375237 91177308-0d34-0410-b5e6-96231b3b80d8

test/ThinLTO/X86/devirt_promote_legacy.ll

@@ -49,7 +49,7 @@ entry:
 
 ; CHECK-IR2: define i32 @test2
 ; Check that the call was devirtualized.
-; CHECK-IR2:   %call4 = tail call i32 @_ZN1A1nEi
+; CHECK-IR2: = tail call i32 @_ZN1A1nEi
 
 declare i1 @llvm.type.test(i8*, metadata)
 declare void @llvm.assume(i1)