RFR: 8290074: Remove implicit arguments for RegisterMap constructor

[Axel Boldt-Christmas]

8290074: Remove implicit arguments for RegisterMap constructor

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Commit messages:
 - Fix spurious semicolon
 - Change to scoped enum
 - 8290074: Remove implicit arguments for RegisterMap constructor
 - 8290074: Remove implicit arguments for RegisterMap constructor
 - 8290074: Remove implicit arguments for RegisterMap constructor

Changes: https://git.openjdk.org/jdk/pull/9455/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9455&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290074
  Stats: 434 lines in 40 files changed: 317 ins; 0 del; 117 mod
  Patch: https://git.openjdk.org/jdk/pull/9455.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9455/head:pull/9455

PR: https://git.openjdk.org/jdk/pull/9455