support fuse layer norm grad for npu #78659

Job	Run time
License and format	1m 4s
Collect information about PR and source	9s
Mirror third party dependencies	1m 5s
Find build cache	10s
Static analysis with clang on diff	42s
Build OneFlow (cu118)	13m 51s
Build OneFlow (cpu)	13m 58s
Build OneFlow (cpu-asan-ubsan)	36s
Build OneFlow (cpu-tsan)	33s
Build OneFlow (llvm15)	13m 24s
Find test cache	1s
Find test cache (distributed)	1s
Test suite	1s
Distributed test suite	1s
	45m 36s

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