RFR: 8364588: Export the NPE backtracking functionality to general null-checking APIs [v4]

[Chen Liang]

> Provide a general facility for our null check APIs like Objects::requireNonNull or future Checks::nullCheck (void), converting the existing infrastructure to start tracking from a given stack site (depth offset) and a given stack slot (offset value).

Chen Liang has updated the pull request incrementally with one additional commit since the last revision:

  Update NPE per roger review

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26600/files
  - new: https://git.openjdk.org/jdk/pull/26600/files/9af7ee85..4ba1f17c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26600&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26600&range=02-03

  Stats: 33 lines in 1 file changed: 12 ins; 4 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/26600.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26600/head:pull/26600

PR: https://git.openjdk.org/jdk/pull/26600