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5953532615
debugserver on arm64 devices can manage both Byte Address Select watchpoints (1-8 bytes) and MASK watchpoints (8 bytes-2 gigabytes). This adds a SupportedWatchpointTypes key to the QSupported response from debugserver with a list of these, so lldb can take full advantage of them when creating larger regions with a single hardware watchpoint. Also add documentation for this, and two other lldb extensions, to the lldb-gdb-remote.txt documentation. Re-enable TestLargeWatchpoint.py on Darwin systems when testing with the in-tree built debugserver. I can remove the "in-tree built debugserver" in the future when this new key is handled by an Xcode debugserver.