[ObjC] Name lookup in methods shouldn't allow shadowing types (#116683)
Arguably as a bug, Clang has previously not mixed up Objective-C
parameter names with types. This allows developers to write parameter
names that _should_ shadow type names, but don't. For instance:
@interface Foo
-(void)foo:(int)id bar:(id)name; // OK
@end
Commit 97788089988a2ace63d717cadbcfe3443f380f9c changed the way that
parameters are parsed to bring it more in line with how C parameters are
parsed, but it breaks the example above. Given an expectation that the
change wouldn't introduce source breaks, this is not something we can go
forward with.
97788089988a2ace63d717cadbcfe3443f380f9c did this so that late-parsed
attributes could reference Objective-C parameters. This change buffers
Objective-C parameter info until after all parameters are parsed and
turns them into parameter declarations before realizing late-parsed
attributes instead.
Radar-ID: 139996306
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