RFR: 8292233: Increase symtab hash table size

[Daniel Jeliński]

Resize the hash table to minimize collisions. The correct size was already calculated, but was not used.

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Commit messages:
 - Increase hash table size

Changes: https://git.openjdk.org/jdk/pull/9834/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9834&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292233
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9834.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9834/head:pull/9834

PR: https://git.openjdk.org/jdk/pull/9834