Mark a function as static since it doesn't use anything in the class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162342 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86VZeroUpper.cpp b/lib/Target/X86/X86VZeroUpper.cpp
index 80b75dc..b7cac99 100644
--- a/lib/Target/X86/X86VZeroUpper.cpp
+++ b/lib/Target/X86/X86VZeroUpper.cpp
@@ -84,7 +84,7 @@
     //  2) All states must be clean for the result to be clean
     //  3) If none above and one unknown, the result state is also unknown
     //
-    unsigned computeState(unsigned PrevState, unsigned CurState) {
+    static unsigned computeState(unsigned PrevState, unsigned CurState) {
       if (PrevState == ST_INIT)
         return CurState;