RFR: 8278874: tighten VerifyStack constraints

[Dean Long]

The VerifyStack logic in Deoptimization::unpack_frames() attempts to check the expression stack size of the interpreter frame against what GenerateOopMap computes.  To do this, it needs to know if the state at the current bci represents the "before" state, meaning the bytecode will be reexecuted, or the "after" state, meaning we will advance to the next bytecode.  The old code didn't know how to determine exactly what state we were in, so it checked both.  This PR cleans that up, so we only have to compute the oopmap once.  It also removes old SPARC support.

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Commit messages:
 - allow Thread::print_on() from JRT_LEAF
 - tighten VerifyStack constraints

Changes: https://git.openjdk.org/jdk/pull/26121/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26121&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8278874
  Stats: 171 lines in 4 files changed: 84 ins; 50 del; 37 mod
  Patch: https://git.openjdk.org/jdk/pull/26121.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26121/head:pull/26121

PR: https://git.openjdk.org/jdk/pull/26121