Sema: Remove stray static

This is a real bug if the code path is ever used with different pointer
sizes in the same process.

llvm-svn: 230893

clang/lib/Sema/SemaChecking.cpp

@@ -2128,7 +2128,7 @@ bool Sema::SemaBuiltinVAStartARM(CallExpr *Call) {
   if (checkBuiltinArgument(*this, Call, 0))
     return true;
 
-  static const struct {
+  const struct {
     unsigned ArgNo;
     QualType Type;
   } ArgumentTypes[] = {