I think this flag is useful for debugging e.g. why something didn't optimize the way you thought.

On Nov 6, 2014 1:05 PM, <git@git.haskell.org> wrote:
Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/ad8457f93807e3b7a9a24867ed69dc93662a29e3/ghc

>---------------------------------------------------------------

commit ad8457f93807e3b7a9a24867ed69dc93662a29e3
Author: Jan Stolarek <jan.stolarek@p.lodz.pl>
Date:   Wed Nov 5 13:37:25 2014 +0100

    Remove -ddump-simpl-phases flag


>---------------------------------------------------------------

ad8457f93807e3b7a9a24867ed69dc93662a29e3
 compiler/main/DynFlags.hs        | 15 +++------------
 compiler/simplCore/CoreMonad.lhs | 40 ++++++----------------------------------
 compiler/simplCore/SimplCore.lhs |  9 +++++----
 docs/users_guide/debugging.xml   | 11 -----------
 docs/users_guide/flags.xml       |  6 ------
 5 files changed, 14 insertions(+), 67 deletions(-)

Diff suppressed because of size. To see it, use:

    git diff-tree --root --patch-with-stat --no-color --find-copies-harder --ignore-space-at-eol --cc ad8457f93807e3b7a9a24867ed69dc93662a29e3
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