[PM] Remove two very old and dead forward declarations for the prior
incarnation of target transform info.

This is in preparation for starting to redesign TTI to be amenable to
the new PM world.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227525 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed