[11u] RFR 8255466: C2 crashes at ciObject::get_oop() const+0x0

[Aleksey Shipilev]

Original fix:
   https://bugs.openjdk.java.net/browse/JDK-8255466
   https://git.openjdk.java.net/jdk/commit/56eb5f54

vectorIntrinsics.cpp hunk is not applicable, because it was added by JDK-8223347 in JDK 16. The rest 
applies cleanly.

11u variant:
   https://cr.openjdk.java.net/~shade/8255466/webrev.11u.01/

Testing: new test (fails without the patch, passes with it); tier{1,2}

-- 
Thanks,
-Aleksey