RFR (7xS): 8071280, 8162928, 8177707, 8177044, 8178148, 8175554, 8178151: Remembered set update/scan improvements

[Kim Barrett]

> On May 5, 2017, at 8:13 AM, Thomas Schatzl <thomas.schatzl at oracle.com> wrote:
> 
> Hi all,
> 
>   recent reviews have made changes necessary to parts of the changeset
> chain.
> 
> Here is a list of links to updated webrevs. Since they have apparently
> not been reviewed yet, I simply overwrote the old webrevs.
> 
> JDK-8177044: Remove _scan_top from HeapRegion
> http://cr.openjdk.java.net/~tschatzl/8177044/webrev/

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src/share/vm/gc/g1/g1RemSet.cpp
 765   if (scan_limit <= start) {
 766     // If the trimmed region is empty, the card must be stale.
 767     return false;

Comment was removed.  I think the comment should be retained.

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Looks good, other than that.

I don't need a new webrev for reinstating the comment.