Remove the cached InstrItineraryData on the TargetMachine, it's unnecessary.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212149 91177308-0d34-0410-b5e6-96231b3b80d8
Remove unnecessary include.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212150 91177308-0d34-0410-b5e6-96231b3b80d8
Move MipsJITInfo to the subtarget rather than the target machine.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212151 91177308-0d34-0410-b5e6-96231b3b80d8
Unify these two lines.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212152 91177308-0d34-0410-b5e6-96231b3b80d8
Break out subtarget initialization that dependent variables need into
a separate function and clean up calling convention for helper function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212153 91177308-0d34-0410-b5e6-96231b3b80d8