RFR: 8228692: BitMap::reallocate might not clear some bits

[stefan.johansson at oracle.com]

Hi Kim,

On 2020-05-22 00:36, Kim Barrett wrote:
> Please review this change to BitMap reallocation that ensures all
> newly added bits are cleared when requested.  Previously, there were
> circumstances where some might not be.  Includes a new gtest for the
> specific issue.
> 
> This change also includes a fix for JDK-8235714.  Contrary to previous
> comments and bug updates, it was not fixed by JDK-8241581 after all.
> This was noticed while testing the change for JDK-8228692.
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8228692
> https://bugs.openjdk.java.net/browse/JDK-8235714
> 
> Webrev:
> https://cr.openjdk.java.net/~kbarrett/8228692/open.00/
Looks good!

Thanks,
Stefan
> 
> Testing:
> mach5 tier1
> 
> Local (linux-x64) BitMap tests, including the new test.  The new test
> (1) failed before the changes, (2) still failed after either one but
> not both of the fix for relocate and the fix for count_one_bits, (3)
> and passes with both fixes.
>