[LLVM] Bump to 8d61da256 #1736

Job	Run time
Build llvm-mlir wasm	1h 41m 52s
build-llvm-mlir windows_amd64	5m 5s
build-llvm-mlir manylinux_x86_64	2h 21m 23s
build-llvm-mlir manylinux_aarch64	1h 33m 57s
build-llvm-mlir macos_arm64	2h 11m 16s
call-deploy-pip-page	0s
call-build-eudsl	0s
call-build-python-bindings	0s
	7h 53m 33s

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