RFR: 8329982: compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/SimpleDebugInfoTest.java failed assert(oopDesc::is_oop_or_null(val)) failed: bad oop found [v2]

[Doug Simon]

> This PR adds the missing nmethod entry barriers to JVMCI hand assembled tests.
> It also closes the escape hatch in jvmciCodeInstaller.cpp that allowed JVMCI code to be installed without nmethod entry barriers.

Doug Simon has updated the pull request incrementally with two additional commits since the last revision:

 - remove vestiges of optional JVMCI nmethod support for entry barriers
 - fixed failing tests and removed tests that install no longer valid code

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/19035/files
  - new: https://git.openjdk.org/jdk/pull/19035/files/62b3ad29..be4bf630

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19035&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19035&range=00-01

  Stats: 426 lines in 12 files changed: 109 ins; 308 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/19035.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19035/head:pull/19035

PR: https://git.openjdk.org/jdk/pull/19035