[clang][VarDecl] Reset un-evaluated constant for all C++ modes #65818
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After commit 610ec95 ("[clang] allow const structs/unions/arrays to
be constant expressions for C"), attempts to evaluate
structs/unions/arrays as constants are also performed for C++98 and
C++03.
An assertion was getting tripped up since the potentially-partially
evaluated value was not being reset for those 2 language modes. Make
sure to reset it now for all C++ modes.
Fixes: #65784