semantic: Introduce `semantic-analyze-tag-type-members'

semantic: Introduce `semantic-analyze-tag-type-members'

* lisp/cedet/semantic/analyze.el (semantic-analyze-tag-type-members)
 (semantic-analyze-tag-type-members-default): New
 (semantic-analyze-find-tag-sequence-default)
 (semantic-analyze-current-context-default):
* lisp/cedet/semantic/db-typecache.el
 (semanticdb-typecache-find):
* lisp/cedet/semantic/scope.el (semantic-completable-tags-from-type)
 (semantic-scope-find):
* lisp/cedet/semantic/analyze/complete.el
 (semantic-analyze-possible-completions-default):
* lisp/cedet/semantic/analyze/debug.el
  (semantic-analyzer-debug-missing-innertype): Use new
 `semantic-analyze-tag-type-members'.