RFR (S) 8175887: C1 value numbering handling of Unsafe.get*Volatile is incorrect

[Vladimir Ivanov]

>>  http://cr.openjdk.java.net/~vlivanov/shade/8175887/
>
> The cleanup look good, but are you sure AssertionError would get reported from
> the thread, and it would not silently die? The original test exited hard to
> handle this.

Good point. Reverted that part. (Updated the webrev in place.)

Best regards,
Vladimir Ivanov