Revert "[SCEV] Use LLVM_MARK_AS_BITMASK_ENUM in SCEV." -- breaks MSVC builds.

This reverts D48237.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@334878 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed