MipsISelLowering.cpp: Fix a warning. [-Wunused-variable]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173323 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp
index a23ffd7..c01e852 100644
--- a/lib/Target/Mips/MipsISelLowering.cpp
+++ b/lib/Target/Mips/MipsISelLowering.cpp
@@ -2892,11 +2892,13 @@
   getMips16HelperFunction
     (Type* RetTy, ArgListTy &Args, bool &needHelper) const {
   const unsigned int maxStubNum = 10;
-  const bool validStubNum[maxStubNum+1] =
-    {true, true, true, false, false, true, true, false, false, true, true};
   const unsigned int stubNum = getMips16HelperFunctionStubNumber(Args);
   assert(stubNum <= maxStubNum);
-  assert (validStubNum[stubNum]);
+#ifdef NDEBUG
+  const bool validStubNum[maxStubNum+1] =
+    {true, true, true, false, false, true, true, false, false, true, true};
+  assert(validStubNum[stubNum]);
+#endif
   const char *result;
   if (RetTy->isFloatTy()) {
     result = sfMips16Helper[stubNum];