RFR: 8340205: Native linker allows MemoryLayout consisting of only PaddingLayout [v2]

[Per Minborg]

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

Per Minborg has updated the pull request incrementally with two additional commits since the last revision:

 - Check exception message
 - Remove redundant doc section

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/21041/files
  - new: https://git.openjdk.org/jdk/pull/21041/files/c1d3b655..d0575fd7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21041&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21041&range=00-01

  Stats: 4 lines in 2 files changed: 1 ins; 1 del; 2 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