RFR: 8201647: Make initial clearing of CHeapBitMap optional

[Per Liden]

Thanks Thomas!

/Per

On 04/17/2018 02:58 PM, Thomas Schatzl wrote:
> Hi,
> 
> On Tue, 2018-04-17 at 14:38 +0200, Per Liden wrote:
>> CHeapBitMap objects will by default clear the underlying bitmap
>> during construction. In ZGC we don't want mark bitmaps to be cleared
>> on construction, since we instead do this lazily during concurrent
>> marking.
>>
>> This patch adds a "bool clear = true" argument to CHeapBitMap's
>> constructor to be able to opt-out of this behavior.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8201647
>> Webrev: http://cr.openjdk.java.net/~pliden/8201647/webrev.0
>>
>> /Per
> 
>    looks good.
> 
> Thomas
>