Michael Liao 3ac8201ea4 Revert part of r166049 back and enable test case in r166125. ...

- Folding (trunc (concat ... X )) to (concat ... (trunc X) ...) is valid
  when '...' are all 'undef's.
- r166125 relies on this transformation.

llvm-svn: 166155

2012-10-17 23:45:54 +00:00

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