[ARM] Teach the cost model that cross-class copies are costly.

Cross-class copies being expensive is actually a trait of the microarchitecture, but as I haven't yet seen an example of a microarchitecture where they're cheap it seems best to just enable this by default, covering the non-mcpu build case.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217674 91177308-0d34-0410-b5e6-96231b3b80d8
[mips][microMIPS] Implement TLBP, TLBR, TLBWI and TLBWR instructions
Differential Revision: http://reviews.llvm.org/D5211


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217675 91177308-0d34-0410-b5e6-96231b3b80d8
[mips][microMIPS] Implement JALS and JALRS instructions.
Differential Revision: http://reviews.llvm.org/D5003


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217676 91177308-0d34-0410-b5e6-96231b3b80d8