Remove the need to cache the subtarget in the X86 TargetRegisterInfo
classes. Use a Triple instead and simplify a lot of the querying
logic to use lookups on the Triple.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232071 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed