[analyzer] Suppress nullability warning for defensive super initializer idiom.

A common idiom in Objective-C initializers is for a defensive nil-check on the
result of a call to a super initializer:
  if (self = [super init]) {
     ...
  }
  return self;

To avoid warning on this idiom, the nullability checker now suppress diagnostics
for returns of nil on syntactic 'return self' even in initializers with non-null
return types.

llvm-svn: 258461