RFR: 8340205: Native linker allows MemoryLayout consisting of only PaddindLayout

[Per Minborg]

This PR prevents sequence layout with padding to be used with the Linker.

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Commit messages:
 - Merge branch 'master' into linker-padding-layout-only
 - Improve excception message
 - Document a sequence layout cannot contain a padding layout
 - Update copyright year
 - Prevent embeded only padding layout in linker

Changes: https://git.openjdk.org/jdk/pull/21041/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21041&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340205
  Stats: 30 lines in 3 files changed: 26 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/21041.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21041/head:pull/21041

PR: https://git.openjdk.org/jdk/pull/21041