C++ PATCH for c++/50508 (ICE on constexpr &&)

[Jason Merrill]

cxx_eval_logical_expression was assuming that a folded first operand of 
&& would be either boolean_true_node or boolean_false_node, but in fact 
it can be a constant with a typedef of bool, which doesn't compare equal 
with ==.  So we should use tree_int_cst_equal to compare them instead.

Tested x86_64-pc-linux-gnu, applying to trunk.
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