Tencent / rapidjson / 2155

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Pull #1485

travis-ci

Handle MemberMap iterators relocation with MSVC _ITERATOR_DEBUG_LEVEL=2.

_ITERATOR_DEBUG_LEVEL=2 insists on seeing every allocator destruction
for its internal tracking, and on that each iterator be at the same
address when it's constructed/assigned and later destructed.

This defeats the simple (POD like) iterators relocation of the Members'
layout in GenericValue::DoReallocMap() when RAPIDJSON_USE_MEMBERS_MAP is
in use. So when compiled with MSVC in Debug mode (or if the user defined
RAPIDJSON_STDMAP_HAS_TRIVIAL_ITERATOR to 0 explicitely), always destroy
the old iterators while they are moved to their new locations.

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