[foreign-memaccess+abi] RFR: Add var handle support for boolean and MemoryAddress carrier [v2]

[Maurizio Cimadamore]

> Add var handle support for boolean and MemoryAddress carrier

Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:

  Remove unused imports
  Fix code to use instaceof + patterns

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/564/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/564/files/a9f0e59d..f0428b7b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=564&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=564&range=00-01

  Stats: 10 lines in 1 file changed: 0 ins; 8 del; 2 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/564.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/564/head:pull/564

PR: https://git.openjdk.java.net/panama-foreign/pull/564