[dev] qtbase\tests\auto\corelib\tools\qhash\tst_qhash.cpp does not compile with MSCV2017

 friend Q_DECL_CONSTEXPR bool operator==(QKeyValueIterator lhs, QKeyValueIterator rhs) Q_DECL_NOEXCEPT { return lhs.i == rhs.i; }
friend Q_DECL_CONSTEXPR bool operator!=(QKeyValueIterator lhs, QKeyValueIterator rhs) Q_DECL_NOEXCEPT { return lhs.i != rhs.i; }

c:\dev\5-vs17-dev\qt-dev\qtbase\include\qtcore\../../src/corelib/tools/qiterator.h(201): error C3615: constexpr function 'operator !=' cannot result in a constant expression
c:\dev\5-vs17-dev\qt-dev\qtbase\include\qtcore\../../src/corelib/tools/qiterator.h(201): note: failure was because type 'QKeyValueIterator<const Key &,const T &,QHash<Key,T>::const_iterator>' is not a literal type
        with
        [
            Key=int,
            T=int
        ]
c:\dev\5-vs17-dev\qt-dev\qtbase\include\qtcore\../../src/corelib/tools/qiterator.h(210): note: type 'QKeyValueIterator<const Key &,const T &,QHash<Key,T>::const_iterator>' is not a literal type because its data member 'i' is of non-literal type 'QHash<int,int>::const_iterator'
        with
        [
            Key=int,
            T=int
        ]
c:\dev\5-vs17-dev\qt-dev\qtbase\include\qtcore\../../src/corelib/tools/qhash.h(363): note: type 'QHash<int,int>::const_iterator' is not a literal type because it is not an aggregate type, a closure type, or does not have a constexpr constructor that is not a copy or move constructor
c:\dev\5-vs17-dev\qt-dev\qtbase\include\qtcore\../../src/corelib/tools/qiterator.h(201): note: failure was because type 'QKeyValueIterator<const Key &,const T &,QHash<Key,T>::const_iterator>' is not a literal type
        with
        [
            Key=int,
            T=int
        ]
c:\dev\5-vs17-dev\qt-dev\qtbase\include\qtcore\../../src/corelib/tools/qiterator.h(210): note: type 'QKeyValueIterator<const Key &,const T &,QHash<Key,T>::const_iterator>' is not a literal type because its data member 'i' is of non-literal type 'QHash<int,int>::const_iterator'
        with
        [
            Key=int,
            T=int
        ]
c:\dev\5-vs17-dev\qt-dev\qtbase\include\qtcore\../../src/corelib/tools/qhash.h(363): note: type 'QHash<int,int>::const_iterator' is not a literal type because it is not an aggregate type, a closure type, or does not have a constexpr constructor that is not a copy or move constructor
c:\dev\5-vs17-dev\qt-dev\qtbase\include\qtcore\../../src/corelib/tools/qiterator.h(201): note: failure was caused by call of undefined function or one not declared 'constexpr'
c:\dev\5-vs17-dev\qt-dev\qtbase\include\qtcore\../../src/corelib/tools/qiterator.h(201): note: see usage of 'QHash<int,int>::const_iterator::operator !='
c:\dev\5-vs17-dev\qt-dev\qtbase\include\qtcore\../../src/corelib/tools/qiterator.h(201): note: while compiling class template member function 'bool operator !=(QKeyValueIterator<const Key &,const T &,QHash<Key,T>::const_iterator>,QKeyValueIterator<const Key &,const T &,QHash<Key,T>::const_iterator>) noexcept'
        with
        [
            Key=int,
            T=int
        ]
tst_qhash.cpp(1131): note: see reference to class template instantiation 'QKeyValueIterator<const Key &,const T &,QHash<Key,T>::const_iterator>' being compiled
        with
        [
            Key=int,
            T=int
        ]