[Clang] Check for uninitialized use in lambda within CXXOperatorCallExpr (#129198)
Track whether a LambdaExpr is an immediate operand of a
CXXOperatorCallExpr using a new flag, isInCXXOperatorCall. This enables
special handling of capture initializations to detect uninitialized
variable uses, such as in `S s = [&]() { return s; }();`.
Fix #128058
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