Use a temporary for non-trivial conditions in conditional expressions…

…. This avoids generating duplicate parentheses in condition code and aligns the code generated for conditional expressions with that for if-statements.

Closes #5555
Closes #5587

Cython/Compiler/ExprNodes.py

@@ -12800,7 +12800,7 @@ def is_ephemeral(self):
         return self.true_val.is_ephemeral() or self.false_val.is_ephemeral()
 
     def analyse_types(self, env):
-        self.test = self.test.analyse_types(env).coerce_to_boolean(env)
+        self.test = self.test.analyse_temp_boolean_expression(env)
         self.true_val = self.true_val.analyse_types(env)
         self.false_val = self.false_val.analyse_types(env)
         return self.analyse_result_type(env)