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Summary: This patch adds support of watchpoints to the old `ProcessWindows` plugin. The `ProcessWindows` plugin uses the `RegisterContext` to set and reset watchpoints. The `RegisterContext` has some interface to access watchpoints, but it is very limited (e.g. it is impossible to retrieve the last triggered watchpoint with it), that's why I have implemented a slightly different interface in the `RegisterContextWindows`. Moreover, I have made the `ProcessWindows` plugin responsible for search of a vacant watchpoint slot, because watchpoints exist per-process (not per-thread), then we can place the same watchpoint in the same slot in different threads. With this scheme threads don't need to have their own watchpoint lists, and it simplifies identifying of the last triggered watchpoint. Reviewers: asmith, stella.stamenova, amccarth Reviewed By: amccarth Subscribers: labath, zturner, leonid.mashinskiy, abidh, JDevlieghere, lldb-commits Tags: #lldb Differential Revision: https://reviews.llvm.org/D67168 llvm-svn: 371166