Mark Lacey 924e30ea61 Rewrite BB args whose only use is in struct/tuple extract. ...

If we have BB args that are only used in a struct/tuple extract, and
that are generated in each predecessor with a struct/tuple instruction,
retype the BB arg and replace the argument with what would have been the
extracted value.

This provides more opportunties for jump threading to kick in.

Swift SVN r16509

2014-04-18 07:19:33 +00:00

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