[8u] RFA for JDK-8134918 - C2: Type speculation produces mismatched unsafe accesses

[Shafi Ahmad]

Hi,

Please approve backport of following dependent bugs to 8u-dev.
1. JDK-8134918 C2: Type speculation produces mismatched unsafe accesses
2. JDK-8140309 [REDO] failed: no mismatched stores, except on raw memory: StoreB StoreI
3. JDK-8162101 C2: Handle "wide" aliases for unsafe accesses
4. JDK-8155781 C2: opaque unsafe access triggers an assert

Jdk9 bug: https://bugs.openjdk.java.net/browse/JDK-8134918
Webrev: http://cr.openjdk.java.net/~shshahma/8134918/webrev.02/
Jdk9 review thread: http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2016-April/022433.html

Jdk9 bug: https://bugs.openjdk.java.net/browse/JDK-8140309
Webrev: http://cr.openjdk.java.net/~shshahma/8140309/webrev.01/
Jdk9 review thread: http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2015-November/019696.html

Jdk9 bug: https://bugs.openjdk.java.net/browse/JDK-8162101
Webrev: http://cr.openjdk.java.net/~shshahma/8162101/webrev.02/
Jdk9 review thread: http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2016-August/024248.html

Jdk9 bug: https://bugs.openjdk.java.net/browse/JDK-8155781
Webrev: http://cr.openjdk.java.net/~shshahma/8155781/webrev.00/
Jdk9 review thread: http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2016-July/023859.html

Jdk8 review links:
 1. http://mail.openjdk.java.net/pipermail/hotspot-dev/2016-November/025182.html
 2. http://mail.openjdk.java.net/pipermail/hotspot-dev/2016-October/024913.html

Regards,
Shafi