RFR: 8315066: Add unsigned bounds and known bits to TypeInt/Long [v19]

[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) == ones`. 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 canonicalize 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
> 
> - [x] GHA
> - [x] Linux x64, tier 1-4

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

  refine comments

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17508/files
  - new: https://git.openjdk.org/jdk/pull/17508/files/a77e8f4a..25643785

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17508&range=18
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17508&range=17-18

  Stats: 11 lines in 1 file changed: 0 ins; 0 del; 11 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