support fuse layer norm grad for npu #78667

Job	Run time
Collect information about PR and source	9s
License and format	1m 2s
Find build cache	10s
Mirror third party dependencies	1m 5s
Static analysis with clang on diff	39m 13s
Build OneFlow (cu118)	14m 33s
Build OneFlow (cpu)	14m 18s
Build OneFlow (cpu-asan-ubsan)	1m 5s
Build OneFlow (cpu-tsan)	32s
Build OneFlow (llvm15)	13m 49s
Find test cache (distributed)	0s
Find test cache	0s
Test suite	0s
Distributed test suite	0s
	1h 25m 56s

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