swift234

Take a bozooka out to fix <rdar://problem/19932544> refine error for using @autoclosure and @noescape on the same decl

We didn't have a consistent way to utter attributes in diagnostics, sometimes saying the

'foo' attribute is not allowed
@foo attribute is not allowed
'foo' is not allowed
@foo is not allowed

etc.  Standardize on the last one, since it is clear (with the @ sign, with no quotes, with no
'attribute' word in the diagnostic) that we're talking about an attribute.  Move a bunch of
diagnostics inline with this.



Swift SVN r25524