RFR: 8315066: Add unsigned bounds and known bits to TypeInt/Long [v2]

[Quan Anh Mai]

> Hi,
> 
> This patch adds unsigned bounds and known bits constraints to TypeInt and TypeLong. This opens more transformation opportunities in an elegant manner as well as helps avoid some ad-hoc rules in Hotspot.
> 
> In general, a TypeInt/Long represents a set of values x that satisfies: x s>= lo && x s<= hi && x u>= ulo && x u<= uhi && (x & zeros) == 0 && (~x & ones) == 0. These constraints are not independent, e.g. an int that lies in [0, 3] in signed domain must also lie in [0, 3] in unsigned domain and have all bits but the last 2 being unset. As a result, we must normalize the constraints (tighten the constraints so that they are optimal) before constructing a TypeInt/Long instance.
> 
> This is extracted from #15440 , node value transformations are left for later PRs. I have also added unit tests to verify the soundness of constraint normalization.
> 
> Please kindly review, thanks a lot.
> 
> Testing
> 
> - [ ] GHA
> - [ ] Linux x64, tier 1-4

Quan Anh Mai has updated the pull request incrementally with one additional commit since the last revision:

  fix tests, add verify

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/17508/files
  - new: https://git.openjdk.org/jdk/pull/17508/files/12f268a1..6b417f94

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17508&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17508&range=00-01

  Stats: 14 lines in 2 files changed: 5 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/17508.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17508/head:pull/17508

PR: https://git.openjdk.org/jdk/pull/17508