RFR: 8253311: Cleanup relocInfo constructors

[Kim Barrett]

8253311: Cleanup relocInfo constructors

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Commit messages:
 - cleanup constructor

Changes: https://git.openjdk.java.net/jdk/pull/265/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=265&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253311
  Stats: 44 lines in 2 files changed: 12 ins; 13 del; 19 mod
  Patch: https://git.openjdk.java.net/jdk/pull/265.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/265/head:pull/265

PR: https://git.openjdk.java.net/jdk/pull/265