RFR: 8143900: OptimizeStringConcat has an opaque dependency on Integer.sizeTable field

[Yi Yang]

Hi, can I have a review for this patch? I noticed a strange field Integer.sizeTable, after digging into its history, I think it could be replaced by an in-place array allocation and initialization.

Thanks.

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Commit messages:
 - 8143900 OptimizeStringConcat has an opaque dependency on Integer.sizeTable field

Changes: https://git.openjdk.org/jdk/pull/12680/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12680&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8143900
  Stats: 105 lines in 3 files changed: 43 ins; 53 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/12680.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12680/head:pull/12680

PR: https://git.openjdk.org/jdk/pull/12680