pkg/cover: don't memorize all coverage points twice

Currently we memorize all coverage points twice:
as a slice and as a map.
The map also contains __sanitizer_cov_trace_cmp PCs,
but I think that's wrong, it should contain only
__sanitizer_cov_trace_pc callbacks.
We were careful to put as least pressure on the GC as possible
by keeping all PCs as a dense allCoverPoints slice and subslicing it
in all symbol/compilation unit objects.
Don't duplicate coverage points in the map and just use the same slice
we store for other purposes.

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