[mips][ias] Moved most instruction emission helpers to MipsTargetStreamer. NFC.

[mips][ias] Moved most instruction emission helpers to MipsTargetStreamer. NFC.

Summary:
* Moved all the emit*() helpers to MipsTargetStreamer.
* Moved createNop() to MipsTargetStreamer as emitNop() and emitEmptyDelaySlot().
  This instruction has been split to distinguish between the 'nop' instruction
  and the nop used in delay slots which is sometimes a different nop to the
  'nop' instruction (e.g. for short delay slots on microMIPS).
* Moved createAddu() to MipsTargetStreamer as emitAddu().
* Moved createAppropriateDSLL() to MipsTargetStreamer as emitDSLL().

Reviewers: sdardis

Subscribers: dsanders, sdardis, llvm-commits

Differential Revision: http://reviews.llvm.org/D19712

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268041 91177308-0d34-0410-b5e6-96231b3b80d8