Remove PC -1 offset from FreeBSD arm64 UpdateAfterBreakpoint

It was a copy-and-paste leftover.

llvm-svn: 256248

lldb/source/Plugins/Process/FreeBSD/RegisterContextPOSIXProcessMonitor_arm64.cpp

@@ -260,13 +260,11 @@ RegisterContextPOSIXProcessMonitor_arm64::HardwareSingleStep(bool enable)
 bool
 RegisterContextPOSIXProcessMonitor_arm64::UpdateAfterBreakpoint()
 {
-    // PC points one byte past the int3 responsible for the breakpoint.
     lldb::addr_t pc;
 
     if ((pc = GetPC()) == LLDB_INVALID_ADDRESS)
         return false;
 
-    SetPC(pc - 1);
     return true;
 }