RFR: 8310053: VarHandle and slice handle derived from layout are lacking alignment check [v2]

[Jorn Vernee]

> Add missing alignment checks for the alignment constraint of the root layout of a VarHandle created through `MemoryLayout::varHandle` and a MethodHandle `MemoryLayout::sliceHandle`.
> 
> Testing: `jdk_foreign` test suite

Jorn Vernee has updated the pull request incrementally with one additional commit since the last revision:

  add note to sliceHandle too

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14475/files
  - new: https://git.openjdk.org/jdk/pull/14475/files/f9845749..1abe7581

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14475&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14475&range=00-01

  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14475.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14475/head:pull/14475

PR: https://git.openjdk.org/jdk/pull/14475