[MC] Remove PhysRegSize from MCRegisterClass

Summary:
The interface to get size and spill size of a register
was moved from MCRegisterInfo to TargetRegisterInfo over
a year ago. Afaik the old interface has bee around
to give out-of-tree targets a chance to adapt to the
new interface.

One problem with the old MCRegisterClass::PhysRegSize was that
it represented the size of a register as "size in bits" / 8.
So a register had to be a multiple of eight bits wide for the
size to be correct (and the byte size for the target needed to
be eight bits).

Reviewers: kparzysz, qcolombet

Reviewed By: kparzysz

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D47199

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@339350 91177308-0d34-0410-b5e6-96231b3b80d8