RFR: 8299683: [S390X] Problems with -XX:+VerifyStack [v2]

[sid8606]

> Deoptimization and uncommon trap stubs require last Java PC to point to a PC which has an appropriate OopMap. Adjusting a offset for PC in last java frame.

sid8606 has updated the pull request incrementally with one additional commit since the last revision:

  Remove offset changes from generate_uncommon_trap_blob stub
  
  Remove offset changes from generate_uncommon_trap_blob stub
  as it has no oop_maps on s390x.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12161/files
  - new: https://git.openjdk.org/jdk/pull/12161/files/d476f6fc..86c02aa4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12161&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12161&range=00-01

  Stats: 5 lines in 1 file changed: 0 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/12161.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12161/head:pull/12161

PR: https://git.openjdk.org/jdk/pull/12161