It was brought to my attention our Objective-C 2.0 dot-syntax implementation
for accessors didn't work with class names (eg, NSObject.class). :-(

Class names are tricky because they normally start a declaration, but in this context
we need to accept them as starting the Objective-C 2.0 dot-syntax, which we didn't.

This patches fixes this for both Objective-C and Objective-C++.  4 testcases
are included.

Ok to commit ?

Thanks

In gcc/:
2010-11-04  Nicola Pero  <nicola.pero@meta-innovation.com>

        Fixed using the Objective-C 2.0 dot-syntax with class names.
        * c-parser.c (c_parser_next_token_starts_declspecs): In
        Objective-C, detect Objective-C 2.0 dot-syntax with a class name.
        (c_parser_next_token_starts_declaration): Same.
        (c_parser_postfix_expression): Parse the Objective-C 2.0
        dot-syntax with a class name.

In gcc/cp/:
2010-11-04  Nicola Pero  <nicola.pero@meta-innovation.com>

        Fixed using the Objective-C 2.0 dot-syntax with class names.
        * parser.c (cp_parser_primary_expression): Recognize Objective-C
        2.0 dot-syntax with class names and process it.
        (cp_parser_nonclass_name): Recognize Objective-C 2.0 dot-syntax
        with class names.
        (cp_parser_class_name): Same change.
        (cp_parser_simple_type_specifier): Tidied comments.

In gcc/c-family/:
2010-11-04  Nicola Pero  <nicola.pero@meta-innovation.com>

        Fixed using the Objective-C 2.0 dot-syntax with class names.
        * c-common.h (objc_build_class_component_ref): New.
        * stub-objc.c (objc_build_class_component_ref): New.

In gcc/objc/:
2010-11-04  Nicola Pero  <nicola.pero@meta-innovation.com>

        Fixed using the Objective-C 2.0 dot-syntax with class names.
        * objc-act.c (objc_build_class_component_ref): New.

In gcc/testsuite/:
2010-11-04  Nicola Pero  <nicola.pero@meta-innovation.com>

        Fixed using the Objective-C 2.0 dot-syntax with class names.
        * objc.dg/property/dotsyntax-3.m: New.
        * objc.dg/property/dotsyntax-4.m: New.
        * obj-c++.dg/property/dotsyntax-3.mm: New.
        * obj-c++.dg/property/dotsyntax-4.mm: New.

        * objc.dg/fobjc-std-1.m: Added test for warnings when the
        Objective-C 2.0 dot-syntax is used with class names.
        * obj-c++.dg/fobjc-std-1.mm: Same change.