[Support] Add vector::erase to JSON::Array (#168835)

Author: evelez7

llvm/include/llvm/Support/JSON.h

@@ -205,6 +205,7 @@ class Array {
   iterator insert(const_iterator P, Value &&E);
   template <typename It> iterator insert(const_iterator P, It A, It Z);
   template <typename... Args> iterator emplace(const_iterator P, Args &&...A);
+  iterator erase(const_iterator P);
 
   friend bool operator==(const Array &L, const Array &R);
 };
@@ -579,6 +580,7 @@ template <typename... Args>
 inline Array::iterator Array::emplace(const_iterator P, Args &&...A) {
   return V.emplace(P, std::forward<Args>(A)...);
 }
+inline Array::iterator Array::erase(const_iterator P) { return V.erase(P); }
 inline bool operator==(const Array &L, const Array &R) { return L.V == R.V; }
 
 /// ObjectKey is a used to capture keys in Object. Like Value but: