c++: ts_lambda is not needed

[Nathan Sidwell]

I've been forced[*] to look at the bits of name-lookup I ran away from 
when reimplementing namespace-scope lookup at the beginning of this 
modules project.  Here's the first change in an expected series.

We don't need ts_lambda, as IDENTIFIER_LAMBDA_P is sufficient.  Killed 
thusly.

         gcc/cp/
         * decl.c (xref_tag_1): Use IDENTIFIER_LAMBDA_P to detect lambdas.
         * lambda.c (begin_lambda_type): Use ts_current to push the tag.
         * name-lookup.h (enum tag_scope): Drop ts_lambda.

pushed to trunk.

nathan

[*] I can only blame myself :)

-- 
Nathan Sidwell
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