RFR(L): 8186027: C2: loop strip mining

[Thomas Schatzl]

Hi,

On Mon, 2017-11-27 at 10:19 -0800, Vladimir Kozlov wrote:
> Second pre-integration re-run finshed and there were timeouts. Looks
> like it depend what hosts were used to run tests.
> 
> I agree to enable it by default on subset if GCs which are sensitive
> to pauses: G1 and Shenandoah.
> 
> Roland, please, prepare changeset.
> 
> I am not sure we need separate CR for setting defaults. It is simple
> to file bug and change only defaults if we need.

  the reason I suggested it is because this defaults change will then
be more prominent when browsing the changesets for explanations of
regressions.

Ie. I am very sure we in the GC team would do that change seperately,
but ymmv.

Thanks,
  Thomas