Remove the LoopBounds from the TempScop class.

  We will use ScalarEvolution in the ScopInfo.cpp to get the loop trip
  count, not cache it in the TempScop object.

Differential Revision: http://reviews.llvm.org/D6070


git-svn-id: https://llvm.org/svn/llvm-project/polly/trunk@221035 91177308-0d34-0410-b5e6-96231b3b80d8