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Continuation parameters that have no uses can be eliminated. This is similar to the reduction for dead values except that that continuation invocations need to be adjusted. Performing a dead parameter reduction can create other dead parameter redexes, dead value redexes, or continuation eta-redexes. Detection of these redexes does not fit the existing model, where an entire deleted subterm is visited after being eliminated from the whole term. Instead, they are detected explicit as part of the reduction implementation. R=asgerf@google.com BUG= Review URL: https://codereview.chromium.org//864293004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@43093 260f80e4-7a28-3924-810f-c04153c831b5