Add basic in-bounds asserts to TinyPtrVector::erase.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161103 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/TinyPtrVector.h

@@ -215,6 +215,9 @@ public:
   }
 
   iterator erase(iterator I) {
+    assert(I >= begin() && "Iterator to erase is out of bounds.");
+    assert(I < end() && "Erasing at past-the-end iterator.");
+
     // If we have a single value, convert to empty.
     if (Val.template is<EltTy>()) {
       if (I == begin())