This was we don't get noisy baselines just because a different phase of the compiler reported
the diagnostic.
This helps with Yui's refactoring work to move grammar checks into the type checker.
Previous commit fixes overly aggressive -noImplictAny reporting. In the test case the source
of the error is the 'getAndSet' property that implicitly gets type any. The fact that the setter
then gets type any isn't actually an error.
