[patch] Make the ObjC attributes diagnostics a bit more informative

[Nico Weber]

Hi,

the attached patch changes the attributes diag I added earlier today from

  test2.mm:3:12: error: postfix attributes are not allowed on Objective-C
directives

to

  test2.mm:3:12: error: postfix attributes are not allowed on Objective-C
directives, place them in front of '@interface'

for @interface and @protocol (and keeps the diagnostic as is for @class and
@implementation).

Ok?

Nico
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