RFR: 8313562: hsperfdata should export module path and "launcher" metadata [v3]

[Larry Cable]

> hsperfdata should expose module metadata if available.

Larry Cable has updated the pull request incrementally with one additional commit since the last revision:

  8313562: added add_optional_property_constant to deal with null valued module properties

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19287/files
  - new: https://git.openjdk.org/jdk/pull/19287/files/001bf3c3..bc9c937f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19287&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19287&range=01-02

  Stats: 15 lines in 2 files changed: 12 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/19287.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19287/head:pull/19287

PR: https://git.openjdk.org/jdk/pull/19287