RFR: 8275063: Implementation of Memory Access API (Second incubator)

[Maurizio Cimadamore]

This PR contains the API and implementation changes for JEP-419 [1]. A more detailed description of such changes, to avoid repetitions during the review process, is included as a separate comment.

[1] - https://openjdk.java.net/jeps/419

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Commit messages:
 - Fix issues with Aarch64 VaList implementation
 - Drop argument type profiling for removed `MemoryAccess` class
 - Add missing files
 - Tweak javadoc for MemeorySegment/MemoryAddress::setUtf8String
 - Initial push from panama/foreign

Changes: https://git.openjdk.java.net/jdk/pull/5907/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5907&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275063
  Stats: 14262 lines in 186 files changed: 6583 ins; 5144 del; 2535 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5907.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5907/head:pull/5907

PR: https://git.openjdk.java.net/jdk/pull/5907