[PATCH] c++: quadratic constexpr behavior for left-assoc logical exprs [PR102780]

[Jakub Jelinek]

On Tue, Oct 26, 2021 at 05:07:43PM -0400, Patrick Palka wrote:
> The performance impact of the other calls to cxx_eval_outermost_const_expr
> from p_c_e_1 is probably already mostly mitigated by the constexpr call
> cache and the fact that we try to evaluate all calls to constexpr
> functions during cp_fold_function anyway (at least with -O).  So trial

constexpr function bodies don't go through cp_fold_function (intentionally,
so that we don't optimize away UB), the bodies are copied before the trees of the
normal copy are folded.

	Jakub