[PATCH v3 0/6] MIPS reorganize the loongson march and extensions instructions set

[Paul Hua]

Hi:

The original path send here:
https://sourceware.org/ml/binutils/2018-08/msg00087.html.
This is the v3 patch.
Small changes compare with v2:
1) update gold link.
2) run Loongson CAM and Loongson EXT test under loongson target.
2) Fix typos.

There are six patches in this set, as follows.
1) MIPS/GAS: Split Loongson CAM Instructions from loongson3a.
2) MIPS/GAS: Split Loongson EXT Instructions from loongson3a
3) MIPS/GAS: Add Loongson EXT2 Instructions support.
4) MIPS: Add Loongson 3A1000 proccessor support.
5) MIPS: Add Loongson 3A2000/3A3000 proccessor support.
6) MIPS: Add Loongson 2K1000 proccessor support.

Paul Hua