Request for reviews (M): 6873116: Modify reexecute implementation to use pcDesc to record the reexecute bit

[Christian Thalinger]

changpeng fang - Sun Microsystems - Santa Clara United States wrote:
> http://cr.openjdk.java.net/~cfang/6873116/webrev.00/
> 
> Fixed 6873116:  Modify reexecute implementation to use pcDesc to record 
> the reexecute bit
> 
> The implementation in this work is mostly from Christian's work on 
> reexecute/mh bit changes.
> 
> Problem:
> Current implementation of reexecute bit uses DebugInfoStreams to record 
> the reexecute bit by compressing the reexecute bit
> into bci field. This makes the code look ugly 
> (e.g.read_bci_and_reexecute(bool& reexecute). It also makes the future 
> addition
> of debuginfo difficult.
> 
> Solution:
> In this work, we use pcDesc to record the reexecute bit obtained from 
> describe_scope, and then store the reexecute bit to
> scopeDesc when a scopeDesc object is created.
> 
> Tests:
>   JPRT, CompileTheWord, refworkload

Looks good.

-- Christian