[patch 4/8] Download tracepoint locations and track its status

[Yao Qi]

This is the major part in gdb side of this patch set.  This patch is to
make use of `inserted' field in bp_location to track whether this
tracepoint location has been downloaded.  This bit is quite similar to
what we are doing to breakpoint.

The difference on breakpoint locations and tracepoint locations is about
`duplicate' field in bp_location, because on the same address, there can
be multiple instances of bp_location which have different trace actions,
so we can't treat one duplicates the other.  In current implementation,
we treat tracepoint location never duplicates with other tracepoint
locations and locations of other breakpoint type.

-- 
Yao (齐尧)
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