The logic seems to want to verify MPSPredicate on maOS 10.14, but not on macOS
10.15+. But checking for macOS 10.14 is always successful on macOS 10.15+,
which means that we can't check for macOS 10.14 before checking macOS 10.15.
So I moved the macOS 10.14 check to after the macOS 10.15 check, but that made
the macOS 10.14 check redundant, because both branches of the condition did
the same thing, so I removed the whole check.
Fixes this introspectionf failure:
[FAIL] DefaultCtorAllowed : 1 potential errors found in 1387 default ctor validated:
Default constructor not allowed for MetalPerformanceShaders.MPSPredicate : Could not initialize an instance of the type 'MetalPerformanceShaders.MPSPredicate': the native 'init' method returned nil.
a2e2fef0c2