RFR: 8215473: [lworld] Support for substitutability checks in C2

[Mandy Chung]

On 1/24/19 6:53 AM, Roland Westrelin wrote:
> http://cr.openjdk.java.net/~roland/8215473/webrev.00/
>

Adding a new ACmpOnValues flag is good.  I'll create a JBS issue for the 
interpreter change.

A minor typo:

+ experimental(uint, ACmpOnValues, 2, \
+ "0 = regular acmp" \
+ "1 = always false for value, perturbation scheme" \
+ "2 = always false for value" \
+ "3 = substitutably test") \
+ range(0, 3) \
  
should be "substitutability test" Thanks Mandy