Add faster invoke_result
for cases where we know we're not dealing with member functions
#1060
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In the spirit of #1058, add a
invoke_result_plain_function
type trait for use in cases where we know that the function is not a member function and we don't need the fullstd::invoke_resutl
. This is true at least in cases where we're checking if a CPO is invocable. More generic cases where the callable comes from the user continue to usestd::invoke_result
.