[9] RFR(S): [BACKOUT] 8087341: C2 doesn't optimize redundant memory operations with G1

[Tobias Hartmann]

Hi,

please review the following change that backs out 8087341 [1] due to the failures reported by 8172850 [2]:
https://bugs.openjdk.java.net/browse/JDK-8173195
http://cr.openjdk.java.net/~thartmann/8173195/webrev.00/

I filed JDK-8173196 [3] to re-implement the enhancement with JDK 10.

Thanks,
Tobias

[1] https://bugs.openjdk.java.net/browse/JDK-8087341
[2] https://bugs.openjdk.java.net/browse/JDK-8172850
[3] https://bugs.openjdk.java.net/browse/JDK-8173196