Fixing this bug is critical because without it the AArch64 build can crash if Java code calls an interface method with 7 or more arguments via an itable stub. For example, this happens in one of the the maven plugins used to run jcstress tests.
The fix tweaks the patch to
to avoid argument register corruption
The risk is low because it has been tested by successfully rerunning the maven build for jcstress correctly and also a variety of Java programs on Aarch64.
It has been reviewed by Andrew Haley.
webrev (for jdk10 and jdkdev) is here: