Bump stablehlo to `f7f8e4e35` and drop LLVM local reverts #30223

Job	Run time
setup / setup	1m 52s
runtime_tracing :: tracy provider	1m 8s
runtime :: ubuntu-20.04	1m 9s
runtime_tracing :: console provider	1m 3s
runtime :: windows-2022	2m 52s
runtime_small	2m 2s
runtime :: macos-14	1m 12s
summary	5s
	11m 23s

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