[code-reflection] RFR: [hat] clean-up non-necessary methods for vector types

[Juan Fumero]

[hat] clean-up non-necessary methods for vector types

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Commit messages:
 - Merge branch 'code-reflection' into hat/cleanup/codegen
 - [hat] clean-up non-necessary methods for vector types

Changes: https://git.openjdk.org/babylon/pull/625/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=625&range=00
  Stats: 84 lines in 5 files changed: 1 ins; 73 del; 10 mod
  Patch: https://git.openjdk.org/babylon/pull/625.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/625/head:pull/625

PR: https://git.openjdk.org/babylon/pull/625