Revert "[X86] Add a new LOW32_ADDR_ACCESS_RBP register class."

This reverts commit r268796.
I believe it breaks test/CodeGen/X86/asm-mismatched-types.ll with:
Cannot emit physreg copy instruction

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268799 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed