[9] RFR(M): 8146629: Make phase->is_IterGVN() accessible from Node::Identity and Node::Value

[Tobias Hartmann]

Hi,

please review the following patch.

https://bugs.openjdk.java.net/browse/JDK-8146629
http://cr.openjdk.java.net/~thartmann/8146629/webrev.00/

Currently, there is no way to determine in Node::Identity() and Node::Value() if we were called from GVN or IGVN but sometimes we would like to do optimizations based on this information (for example, see discussion in RFR for JDK-8136469 [1]). I changed the arguments of Node::Identity() and Node::Value() from PhaseTransform* to PhaseGVN*. Like this, we can simply call PhaseValues::is_IterGVN() from both methods.

Thanks,
Tobias

[1] http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2016-January/020670.html