[analyzer] Nullability: allow cast to _Nonnull to suppress warning about returning nil.

The nullability checker currently allows casts to suppress warnings when a nil
literal is passed as an argument to a parameter annotated as _Nonnull:

  foo((NSString * _Nonnull)nil); // no-warning

It does so by suppressing the diagnostic when the *type* of the argument expression
is _Nonnull -- even when the symbolic value returned is known to be nil.

This commit updates the nullability checker to similarly honor such casts in the analogous
scenario when nil is returned from a function with a _Nonnull return type:

  return (NSString * _Nonnull)nil; // no-warning

This commit also normalizes variable naming between the parameter and return cases and
adds several tests demonstrating the limitations of this suppression mechanism (such as
when nil is cast to _Nonnull and then stored into a local variable without a nullability
qualifier). These tests are marked with FIXMEs.

rdar://problem/23176782

llvm-svn: 256567