Merge TempScopInfo.{cpp|h} into ScopInfo.{cpp|h}

This prepares for a series of patches that merges TempScopInfo into ScopInfo to
reduce Polly's code complexity. Only ScopInfo.{cpp|h} will be left thereafter.
Moving the code of TempScopInfo in one commit makes the mains diffs simpler to
understand.

In detail, merging the following classes is planned:
TempScopInfo into ScopInfo
TempScop into Scop
IRAccess into MemoryAccess

Only moving code, no functional changes intended.

Differential Version: http://reviews.llvm.org/D12693

llvm-svn: 247274