[MFProperties][NFC] Rename clear into reset to match BitVector naming.

The name clear is used to reset all the bit in bitvectors and using it
to reset just properties was confusing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279873 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed