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ca61961380
Implement https://cplusplus.github.io/CWG/issues/2631.html. Immediate calls in default arguments and defaults members are not evaluated. Instead, we evaluate them when constructing a `CXXDefaultArgExpr`/`BuildCXXDefaultInitExpr`. The immediate calls are executed by doing a transform on the initializing expression. Note that lambdas are not considering subexpressions so we do not need to transform them. As a result of this patch, unused default member initializers are not considered odr-used, and errors about members binding to local variables in an outer scope only surface at the point where a constructor is defined. Reviewed By: aaron.ballman, #clang-language-wg, rupprecht Differential Revision: https://reviews.llvm.org/D136554