Bug report

Code snippet that reproduces the problem

Using PHPStan v1.3.0, it assumes that all memcached installations have SASL support.

https://phpstan.org/r/21ec5d0c-0f4e-499c-87ee-9b842a8ce5e6 (using the constant Memcached::HAVE_SASL)
https://phpstan.org/r/ccb205ad-89bb-4af1-b3e9-2330603d3a8e (using the method check on Memcached::setSaslAuthData)

Expected output

Previously on versions before 1.3.0, adding the constant name (Memcached::HAVE_SASL) on the dynamicConstantNames parameter in phpstan.neon clears the error away. However, starting on 1.3.0, the error will become Strict comparison between 0 and false will always evaluate to false. This only happens on machines with ext-memcached installed. On Windows, there's no error. Disabling the RuntimeReflectionProvider does not help either.

For the method_exists error, this is my first time encountering this error in a bid to go away with the constant name but I suppose it also errors.

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