Make InstrInfo depend only upon the Subtarget getting passed in
rather than the TargetMachine.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213425 91177308-0d34-0410-b5e6-96231b3b80d8
In preparation for replacing the whole subtarget on the target machine,
have target lowering take the subtarget explicitly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213426 91177308-0d34-0410-b5e6-96231b3b80d8