openvmm: add basic gdbstub support for aarch64 (#307) #234

Job	Run time
build mdbook guide	1m 23s
build and check docs [x64-windows]	9m 1s
build openhcl [aarch64-linux]	7m 43s
build openhcl [x64-linux]	9m 52s
clippy [windows], unit tests [x64-windows]	16m 49s
clippy [linux, macos], unit tests [x64-linux]	12m 6s
clippy [linux-musl, misc nostd], unit tests [x64-linux-musl]	11m 3s
build artifacts [aarch64-linux]	5m 56s
unit tests [aarch64-windows]	8m 46s
build and check docs [x64-linux]	2m 47s
test flowey local backend	3m 4s
build artifacts (not for VMM tests) [aarch64-windows]	4m 50s
xtask fmt (linux)	2m 24s
build artifacts (for VMM tests) [aarch64-windows]	16m 22s
build artifacts (not for VMM tests) [x64-windows]	4m 54s
build artifacts (for VMM tests) [x64-windows]	16m 28s
build artifacts [x64-linux]	6m 44s
xtask fmt (windows)	7m 12s
publish openvmm.dev	47s
run vmm-tests [aarch64-windows]	6m 13s
run vmm-tests [x64-windows-intel]	6m 42s
run vmm-tests [x64-linux]	3m 34s
run vmm-tests [x64-windows-amd]	7m 1s
	2h 51m 41s

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