RFR: 8321159: SymbolLookup.libraryLookup(Path, Arena) Assumes default Filesystem [v4]

[Per Minborg]

> This PR proposes to reject paths provided to the `SymbolLookup.libraryLookup(Path path, Arena arena)` method if a path is not in the default file system.

Per Minborg has updated the pull request incrementally with one additional commit since the last revision:

  Change @throws description

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16944/files
  - new: https://git.openjdk.org/jdk/pull/16944/files/f1693824..fae3db5d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16944&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16944&range=02-03

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16944.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16944/head:pull/16944

PR: https://git.openjdk.org/jdk/pull/16944