RFR: 8177673: [JVMCI] missing checks in HotSpotMemoryAccessProviderImpl can cause VM assertions to fail

[Doug Simon]

Please review this patch to fix a VM-level assertion failure due to missing sanity checks in HotSpotMemoryAccessProviderImpl. The sanity checking has been enhanced to map an object+displacement back to a field before performing a read. If the mapping fails, an IllegalArgumentException is thrown.

Tested on Graal.

-Doug

http://cr.openjdk.java.net/~dnsimon/8177673/webrev/
https://bugs.openjdk.java.net/browse/JDK-8177673