[GR-71261] [GR-71478] Fold reads from stable arrays. #12578
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Reads from stable arrays are currently not constant folded correctly. For example,
java.lang.Integer$IntegerCache.cacheis a 1 dimensional array withstableDimensions = 1. Reads from that array should be constant folded if the index is a constant as well.This PR also fixes a problem with the rematerialization of boxed primitives during deoptimization. So far, we always created new instances when rematerializing boxed primitives. This is not correct for cached boxed primitives.