[foreign-memaccess+abi] RFR: 8307253: Make FunctionDescriptor::toMethodType an instance method of Linker [v4]

[Maurizio Cimadamore]

> This patch moves `FunctionDescriptor::toMethodType` as an instance method of `Linker`. This allows linker implementations to be more opinionated on how the function descriptor -> method type conversion should behave.

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

  Address review comment (tweak test to use non-void factory)

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Changes:
  - all: https://git.openjdk.org/panama-foreign/pull/830/files
  - new: https://git.openjdk.org/panama-foreign/pull/830/files/c63efe57..c5a733d7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=panama-foreign&pr=830&range=03
 - incr: https://webrevs.openjdk.org/?repo=panama-foreign&pr=830&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/panama-foreign/pull/830.diff
  Fetch: git fetch https://git.openjdk.org/panama-foreign.git pull/830/head:pull/830

PR: https://git.openjdk.org/panama-foreign/pull/830