Fix to handle AArch64 watchpoint exception before instruction being watched is executed

[omjavaid]

Summary

LLDB needs to know whether a watchpoint instruction is executed before or after the watchpoint exception is delivered.

This patch fixes this behavior for AArch64 and makes sure lldb disables and steps over the watchpoint instruction after watchpoint exception is delivered.

[clayborg]

Looks good.

[emaste]

source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp

186–187

minor point, but you could put these first in the list to keep them in alpha order

[tberghammer]

LGTM

source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp

         response.Printf("watchpoint_exceptions_received:after;");
 #else
     if (host_arch.GetMachine() == llvm::Triple::mips64 ||
-        host_arch.GetMachine() == llvm::Triple::mips64el)
+        host_arch.GetMachine() == llvm::Triple::mips64el ||
+        host_arch.GetMachine() == llvm::Triple::aarch64 ||
+        host_arch.GetMachine() == llvm::Triple::aarch64_be)
         response.Printf("watchpoint_exceptions_received:before;");
     else
         response.Printf("watchpoint_exceptions_received:after;");