Use imprecise constants at compilation time.

During veriifcation, we create constant types for the following instructions:
const/4, const/16, const and const/high16. We used to create "precise" constant
types for each constant we process in the method being verified. Though precise
constants are only useful for deoptimization which happens at runtime.

This CL now creates "imprecise" constant types at compilation time. Since it
reduces the number of constant types we create during verification, it should
also reduce the amount of time spent in verification at compilation time.

Bug: 12167380
Bug: 12126841
Change-Id: I70522c4133a74a533fc2d2cb8d4f49888e590828
4 files changed