support fuse layer norm grad for npu #78665

Job	Run time
License and format	1m 6s
Collect information about PR and source	10s
Mirror third party dependencies	1m 3s
Find build cache	11s
Static analysis with clang on diff	39m 54s
Build OneFlow (cu118)	14m 36s
Build OneFlow (cpu)	14m 27s
Build OneFlow (cpu-asan-ubsan)	48s
Build OneFlow (cpu-tsan)	57s
Build OneFlow (llvm15)	13m 44s
Find test cache	0s
Find test cache (distributed)	0s
Test suite	0s
Distributed test suite	0s
	1h 26m 56s

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