Bug report

Hi,

With this code, phpstan report the error Call to function constant() on a separate line has no effect.:

try {
    constant('FOO');
} catch (\Error) {
}

But it should not report an error because constant() can throw an exception when the constant is not found, so we can call constant() without assigning it's return to a variable, just to know if the constant exists.

Code snippet that reproduces the problem

https://phpstan.org/r/0ef2088f-142b-404b-9bb2-a1a0bb7ae01e

Expected output

No error

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