[patch 3/8] New target hook `to_can_download_tracepoint_loc'

[Yao Qi]

This patch is to add a new target hook 'to_can_download_tracepoint_loc'
to determine whether it is OK for remote target to receive tracepoint
locations.

Note that, `download_tracepoint_loc' itself can check this in lower
level, but it is not efficient, and it leaves managing location's status
to lower level.

This patch is needed by patch 4/8.

-- 
Yao (齐尧)
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