[jdk13u-dev] RFR: 8231586: enlarge encoding space for OopMapValue offsets

[Olga Mikhaltsova]

I'd like to backport JDK-8231586 to jdk13u for parity with jdk11u.
The original patch applied cleanly.
Tested with tier1. No regression in tests.

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Commit messages:
 - Backport 4a41f86a39de90f157adc296384ee7407f9f2a91

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/84/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=84&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8231586
  Stats: 173 lines in 6 files changed: 36 ins; 96 del; 41 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/84.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/84/head:pull/84

PR: https://git.openjdk.java.net/jdk13u-dev/pull/84