Summary:
* Investigate how to expand conditional compare.

Details:
1. Try to expand conditional compare to RTL
  * It seams hard to expand conditional compare to just one cond_exec
insn during expand, since it has to know the cc (GT, LT, etc) set from
previous instruction and tell the later instruction which cc (GT, LT,
etc) it set.
  * Try to add new RTL key-word and insn pattern.

2. Follow up Linaro toolchain binaries bug in Yocto build: 1159392,
1161348 and 1161351.

Plan:
* Generate asm for conditional compare.

Planned leaves:
* April 4-8: Chinese Ching Ming Festival and annual leaves.
* April 12: Internal team event.
* April 16-17: Internal training.

Best Regards!
-Zhenqiang

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