RFR: Purge partial heuristics and connection matrix infrastructure

[Roman Kennke]

The patch looks good. Thanks!
Roman

> Friendly reminder: please review. The patch is not small, and there is a chance it would rot.
> 
> -Aleksey
> 
> On 09/07/2018 10:21 AM, Aleksey Shipilev wrote:
>> http://cr.openjdk.java.net/~shade/shenandoah/remove-partial/webrev.01/
>>
>> As discussed earlier [1], this patch removes partial heuristics and associated matrix machinery.
>> This greatly simplifies the codebase.
>>
>> Testing: x86_64 tier3_gc_shenandoah {fastdebug|release}, aarch64 build
>>
>> [1] http://mail.openjdk.java.net/pipermail/shenandoah-dev/2018-September/007385.html
>>
> 
>