[lworld] RFR: 8343846: [lworld] implement spec changes to stack map tables [v3]

[Matias Saavedra Silva]

> This patch implements the spec changes needed to realize the ACC_STRICT flag. See the JBS issue for more details. 
> 
> The patch is divided across 3 major commits:
> 1. VM changes for asserting that strict fields are initialized before the super constructor is called
> 2. Javac changes for generating the stack map table entries
> 3. Test
> 
> Verified with tier 1-3 tests

Matias Saavedra Silva has updated the pull request incrementally with two additional commits since the last revision:

 - Changed AssertUnsetFieldsTable to NameAndSig to bool
 - Coleen suggestions

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

Changes:
  - all: https://git.openjdk.org/valhalla/pull/1373/files
  - new: https://git.openjdk.org/valhalla/pull/1373/files/040d3eac..728753ba

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=1373&range=02
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=1373&range=01-02

  Stats: 45 lines in 6 files changed: 11 ins; 13 del; 21 mod
  Patch: https://git.openjdk.org/valhalla/pull/1373.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1373/head:pull/1373

PR: https://git.openjdk.org/valhalla/pull/1373