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Watchpoints from lldb-server are sent in the stop info packet as a `reason:watchpoint` and `description:asciihex` keys; the latter's asciihex has one to three integer values. This patch documents the purpose of those three different numbers, and clarifies the behavior on MIPS with the third number which is outside the range of any watched memory range means to silently skip the watchpoint. lldb was previously using this silently skip watchpoint behavior for AArch64 as well, but in the case of AArch64 we see a watchpoint address outside of a watched memory range when the write BEGINS before the watched memory range, but extends in to it. We don't want to silently skip these. Differential Revision: https://reviews.llvm.org/D147816 rdar://83996471