RFR: 8340205: Native linker allows MemoryLayout consisting of only PaddingLayout [v9]

[Per Minborg]

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

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

 - Update test/jdk/java/foreign/TestLinker.java
   
   Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
 - Update src/java.base/share/classes/jdk/internal/foreign/abi/AbstractLinker.java
   
   Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
 - Update src/java.base/share/classes/jdk/internal/foreign/abi/AbstractLinker.java
   
   Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
 - Update src/java.base/share/classes/jdk/internal/foreign/abi/AbstractLinker.java
   
   Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
 - Update src/java.base/share/classes/jdk/internal/foreign/abi/AbstractLinker.java
   
   Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
 - Update src/java.base/share/classes/java/lang/foreign/Linker.java
   
   Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
 - Update src/java.base/share/classes/java/lang/foreign/Linker.java
   
   Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21041/files
  - new: https://git.openjdk.org/jdk/pull/21041/files/0f4e93ff..e81b34f1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21041&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21041&range=07-08

  Stats: 7 lines in 3 files changed: 0 ins; 0 del; 7 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